jweimer

Hello folks, Well, it's been a while but I do have a positive update after 1 month of what seems to be the root cause/corrective action. The problem was the O2 sensor connector at the firewall (where 02 sensor plugs in). Apparently the connector latch broke thus the connector was not secure causing an intermittent fault. The remedy was to zip tie the connector (interim solution) so that it stays secure. Additional background: Since my last posting on 2/26/17, I continued to drive the Cayenne, resetting the CEL with my BlueDriver OBD!! scanner. My emissions test date came about in December 2018 so I decided to be more proactive to find the issue. I replaced the K&N cold air intake with the standard air filter setup to remove any doubt about air filter oil contamination of the MAF sensor. I also replaced both MAF sensors. The issue remained. I followed Lauren's advice and looked for leaks in the exhaust system by creating a smoke machine (see YouTube) and testing for leaks. After numerous tests and inhaling mineral oil fumes (not recommended) there were no leaks to be found. Going beyond this myself would have required too much time so I brought the Cayenne into an independent shop that I trust. They ended up finding that the connector latch was broken, applied a zip tie and then road tested for a few days. I picked the Cayenne up, passed the emissions test and it has been fine for almost 1 month. Keeping my fingers crossed that, after writing this, that it remains to be the root cause and "remedy"

here's one other update: Note: Fuel system status: "system A" will eventually reach closed loop. "System B" never reaches closed loop Note: this is after taking out and cleaning passenger side MAF. Note: depending upon how long car has been turned off, bank 1 sensor 1 will slowly start to work. i.e. - off for 2 hours, starts normally (like in rows 12 through 439, i.e off for 30 minutes it seems like lambda gets biased at around 1.7 but will show spikes that correlate to bank 2 sensor 1. In other words it looks like it would mimic bank 2 senor 1 but has a constant bias of 1.7)

Hi Folks, I bought a Bluedriver scan tool so that I can actually do data logging simply. I also have a durametric tool but need to install it. Below listed is a scan that I took after the vehicle was up to temperature. The bank 1 sensor 1 lamba ratio is a constant value of 1.99 and shows not sign of fluctuation when graphed whereas bank 2 sensor 1 does fluctuate when graphed and also numerically when the data was logged. I know the values are simply a point in time but sensor 1 bank 1 does not appear functional. I also cleared the P0130 code but the sensor reading remained at 1.99 and created a pending code of P0130, which makes sense to me. Also, the back 1 sensor 1 current seems to be high and fuctuate less than bank 2 sensor 1. Again, the sensor was just replaced three weeks ago. Also, when does a pending code get moved to an actual code? This seems to vary in time and miles. Is this correct? If correct then this probably answers why my CEL comes on at different times/miles under the same driving conditions. BlueDriver Data Log 26-Feb 2017 Time(s) O2 Bank 1 - Sensor 2 - Oxygen Sensor Voltage (V) O2 Bank 2 - Sensor 2 Oxygen Sensor Voltage (V) Wide Range O2S: Bank 1 - Sensor 1 - Current (mA) Wide Range O2S: Bank 2 - Sensor 1 - Current (mA) Wide Range O2S: Bank 1 - Sensor 1 - Equivalence Ratio (λ) Wide Range O2S: Bank 2 - Sensor 1 - Equivalence Ratio (λ) O2 Bank 1 - Sensor 2 - Short Term Fuel Trim (%) O2 Bank 2 - Sensor 2 Short Term Fuel Trim (%) 0 0.855 0.8 0.857 0.645 99.2 1.6 0.858 0.645 1.662 99.2 99.2 2.4 0.86 0.645 1.653 -0.007 1.999 1.001 99.2 99.2 3.2 0.859 0.645 1.644 0.01 1.999 1.006 99.2 99.2 4 0.855 0.642 1.637 0.027 1.999 1.011 99.2 99.2 4.8 0.855 0.641 1.651 0.042 1.999 1.015 99.2 99.2 5.6 0.854 0.64 1.648 0.045 1.999 1.02 99.2 99.2 6.4 0.851 0.535 1.645 0.059 1.999 1.024 99.2 99.2 7.2 0.85 0.208 1.637 0.072 1.999 1.029 99.2 99.2 8 0.85 0.154 1.621 0.065 1.999 1.03 99.2 99.2 8.8 0.847 0.131 1.616 0.032 1.999 1.016 99.2 99.2 9.6 0.846 0.362 1.613 0.038 1.999 1.018 99.2 99.2 10.4 0.845 0.336 1.617 0.036 1.999 1.018 99.2 99.2 11.2 0.846 0.311 1.613 0.022 1.999 1.007 99.2 99.2 12 0.85 0.288 1.61 0.025 1.999 1.007 99.2 99.2 12.8 0.85 0.268 1.628 0.025 1.999 1.008 99.2 99.2 13.6 0.85 0.243 1.626 -0.003 1.999 1.006 99.2 99.2 14.4 0.851 0.227 1.623 -0.002 1.999 1.001 99.2 99.2 15.2 0.85 0.601 1.62 -0.001 1.999 1.001 99.2 99.2 16 0.85 0.599 1.609 0 1.999 1.001 99.2 99.2 16.8 0.85 0.597 1.606 -0.002 1.999 1.001 99.2 99.2 17.6 0.85 0.594 1.603 -0.008 1.999 1.001 99.2 99.2 18.4 0.85 0.585 1.603 -0.008 1.999 1.001 99.2 99.2 19.2 0.85 0.583 1.617 -0.004 1.999 1.001 99.2 99.2 20 0.85 0.58 1.615 0.01 1.999 1.005 99.2 99.2 20.8 0.85 0.585 1.617 0.011 1.999 1.005 99.2 99.2 21.6 0.85 0.583 1.66 0.011 1.999 1.005 99.2 99.2 22.4 0.85 0.58 1.66 0.003 1.999 1.004 99.2 99.2 23.2 0.85 0.585 1.66 0.003 1.999 1.001 99.2 99.2 24 0.85 0.602 1.62 0.001 1.999 1.001 99.2 99.2 24.8 0.851 0.6 1.619 -0.038 1.999 0.998 99.2 99.2 25.6 0.855 0.606 1.617 -0.038 1.999 0.991 99.2 99.2 26.4 0.855 0.631 1.617 -0.039 1.999 0.991 99.2 99.2 27.2 0.855 0.63 1.619 -0.038 1.999 0.992 99.2 99.2 28 0.86 0.63 1.618 -0.035 1.999 0.998 99.2 99.2 28.8 0.86 0.631 1.623 -0.035 1.999 0.998 99.2 99.2 29.6 0.86 0.63 1.645 -0.085 1.999 0.99 99.2 99.2 30.4 0.86 0.597 1.645 -0.211 1.999 0.947 99.2 99.2 31.2 0.86 0.293 1.636 -0.217 1.999 0.946 99.2 99.2 32 0.86 0.284 1.589 -0.172 1.999 0.946 99.2 99.2 32.8 0.858 0.277 1.587 0.029 1.999 0.987 99.2 99.2 33.6 0.85 0.555 1.584 0.031 1.999 0.987 99.2 99.2 34.4 0.85 0.553 1.571 0.03 1.999 0.987 99.2 99.2 35.2 0.85 0.55 1.569 0.018 1.999 0.993 99.2 99.2 36 0.85 0.59 1.566 0.019 1.999 1.008 99.2 99.2 36.8 0.85 0.713 1.654 0.02 1.999 1.008 99.2 99.2 37.6 0.842 0.714 1.858 0.059 1.999 1.015 99.2 99.2 38.4 0.745 0.615 1.862 0.061 1.999 1.046 99.2 99.2 39.2 0.743 0.088 1.826 0.062 1.999 1.047 99.2 99.2 40 0.74 0.076 1.672 0.063 1.999 1.044 99.2 99.2 40.8 0.745 0.066 1.672 0.064 1.999 1.014 99.2 99.2 41.6 0.763 0.133 1.668 0.065 1.999 1.014 99.2 99.2 42.4 0.761 0.123 1.619 0.065 1.999 1.014 99.2 99.2 43.2 0.771 0.113 1.618 0.052 1.999 1.01 99.2 99.2 44 0.85 0.133 1.617 0.053 1.999 0.996 99.2 99.2 44.8 0.85 0.231 1.609 0.055 1.999 0.996 99.2 99.2 45.6 0.85 0.223 1.588 0.048 1.999 0.997 99.2 99.2 46.4 0.85 0.223 1.586 0.03 1.999 1.002 99.2 99.2 47.2 0.85 0.252 1.589 0.031 1.999 1.002 99.2 99.2 48 0.85 0.246 1.603 0.028 1.999 1.001 99.2 99.2 48.8 0.85 0.262 1.602 0.015 1.999 0.991 99.2 99.2 49.6 0.85 0.655 1.606 0.015 1.999 0.991 99.2 99.2 50.4 0.85 0.655 1.645 0.002 1.999 0.991 99.2 99.2 51.2 0.85 0.655 1.645 -0.095 1.999 0.993 99.2 99.2 52 0.85 0.654 1.644 -0.097 1.999 0.999 99.2 99.2 52.8 0.85 0.65 1.626 -0.087 1.999 0.999 99.2 99.2 53.6 0.85 0.65 1.626 0.075 1.999 1.001 99.2 99.2 54.4 0.845 0.58 1.625 0.076 1.999 1.009 99.2 99.2 55.2 0.845 0.236 1.628 0.078 1.999 1.009 99.2 99.2 56 0.845 0.23 1.641 0.021 1.999 1.008 99.2 99.2 56.8 0.849 0.248 1.641 -0.176 1.999 0.987 99.2 99.2 57.6 0.86 0.655 1.634 -0.178 1.999 0.987 99.2 99.2 58.4 0.86 0.655 1.58 -0.217 1.999 0.987 99.2 99.2 59.2 0.862 0.655 1.579 -0.416 1.999 0.987 99.2 99.2 60 0.87 0.625 1.58 -0.422 1.999 0.987 99.2 99.2 60.8 0.87 0.556 1.611 -0.39 1.999 0.987 99.2 99.2 61.6 0.868 0.555 1.61 0.019 1.999 0.989 99.2 99.2 62.4 0.86 0.61 1.609 0.019 1.999 0.994 99.2 99.2 63.2 0.86 0.802 1.607 0.019 1.999 0.994 99.2 99.2 64 0.828 0.804 1.603 -0.045 1.999 1.094 99.2 99.2 64.8 0.057 0.721 1.602 -0.219 1.999 1.641 99.2 99.2 65.6 0.047 0.02 1.843 -0.222 1.999 1.649 99.2 99.2 66.4 0.037 0.013 3.27 0.257 1.999 1.672 99.2 99.2 67.2 0.027 0.005 3.29 2.324 1.999 1.976 99.2 99.2 68 0.017 0.049 3.205 2.352 1.999 1.988 99.2 99.2 68.8 0.007 0.042 2.073 2.004 1.999 1.964 99.2 99.2 69.6 0.174 0.035 2.078 -0.069 1.999 0.954 99.2 99.2 70.4 0.737 0.116 2.071 -0.07 1.999 0.954 99.2 99.2 71.2 0.736 0.315 1.877 -0.077 1.999 0.953 99.2 99.2 72 0.749 0.311 1.88 -0.161 1.999 0.958 99.2 99.2 72.8 0.84 0.399 1.882 -0.162 1.999 0.973 99.2 99.2 73.6 0.84 0.748 1.864 -0.164 1.999 0.973 99.2 99.2 74.4 0.838 0.749 1.807 -0.12 1.999 0.981 99.2 99.2 75.2 0.821 0.741 1.808 -0.031 1.999 1.011 99.2 99.2 76 0.82 0.679 1.813 -0.031 1.999 1.011 99.2 99.2 76.8 0.82 0.679 1.827 -0.061 1.999 1.01 99.2 99.2 77.6 0.826 0.68 1.829 -0.061 1.999 1.003 99.2 99.2 78.4 0.826 0.68 1.831 -0.062 1.999 1.003 99.2 99.2 79.2 0.825 0.669 1.83 -0.062 1.999 1.003 99.2 99.2 80 0.825 0.67 1.809 -0.057 1.999 1.008 99.2 99.2 80.8 0.743 0.67 1.811 -0.019 1.999 1.925 99.2 99.2 81.6 0.047 0.575 1.812 -0.019 1.999 1.935 99.2 99.2 82.4 0.039 0.029 2.068 -0.002 1.999 1.944 99.2 99.2 83.2 0.031 0.022 3.249 2.062 1.999 1.954 99.2 99.2 84 0.023 0.016 3.264 2.083 1.999 1.963 99.2 99.2 84.8 0.016 0.01 3.279 2.103 1.999 1.973 99.2 99.2 85.6 0.018 0.006 3.295 2.124 1.999 1.982 99.2 99.2 86.4 0.035 0.052 3.159 2.144 1.999 1.991 99.2 99.2 87.2 0.027 0.046 2.025 1.792 1.999 1.94 99.2 99.2 88 0.044 0.041 2.028 0.2 1.999 1.09 99.2 99.2 88.8 0.12 0.044 2.029 0.202 1.999 1.091 99.2 99.2 89.6 0.113 0.061 1.96 0.168 1.999 1.092 99.2 99.2 90.4 0.211 0.056 1.962 -0.119 1.999 1.051 99.2 99.2 91.2 0.781 0.225 1.964 -0.12 1.999 0.944 99.2 99.2 92 0.78 0.749 1.813 -0.113 1.999 0.943 99.2 99.2 92.8 0.779 0.75 1.815 0.015 1.999 0.958 99.2 99.2 93.6 0.766 0.735 1.816 0.015 1.999 1.014 99.2 99.2 94.4 0.766 0.655 1.809 0.016 1.999 1.014 99.2 99.2 95.2 0.767 0.655 1.784 -0.014 1.999 1.009 99.2 99.2 96 0.811 0.66 1.785 -0.085 1.999 0.985 99.2 99.2 96.8 0.81 0.699 1.79 -0.086 1.999 0.984 99.2 99.2 97.6 0.809 0.7 1.807 -0.049 1.999 0.995 99.2 99.2 98.4 0.786 0.701 1.808 0.042 1.999 1.049 99.2 99.2 99.2 0.785 0.709 1.801 0.043 1.999 1.049 99.2 99.2 100 0.786 0.71 1.768 0.043 1.999 1.044 99.2 99.2 100.8 0.806 0.64 1.769 0.042 1.999 1.016 99.2 99.2 101.6 0.805 0.104 1.781 0.043 1.999 1.016 99.2 99.2 102.4 0.805 0.099 1.83 -0.004 1.999 1.009 99.2 99.2 103.2 0.809 0.097 1.831 -0.189 1.999 0.914 99.2 99.2 104 0.82 0.684 1.83 -0.191 1.999 0.914 99.2 99.2 104.8 0.82 0.685 1.799 -0.161 1.999 0.916 99.2 99.2 105.6 0.814 0.685 1.8 0.011 1.999 1.009 99.2 99.2 106.4 0.791 0.676 1.801 0.012 1.999 1.009 99.2 99.2 107.2 0.79 0.65 1.806 0.016 1.999 1.009 99.2 99.2 108 0.676 0.65 1.807 0.058 1.999 1.225 99.2 99.2 108.8 0.046 0.508 1.809 0.058 1.999 1.793 99.2 99.2 109.6 0.04 0.013 2.216 0.078 1.999 1.799 99.2 99.2 110.4 0.038 0.008 3.264 0.638 1.999 1.668 99.2 99.2 111.2 0.091 0.011 3.275 0.642 1.999 1.173 99.2 99.2 112 0.085 0.067 3.077 0.647 1.999 1.174 99.2 99.2 112.8 0.092 0.063 1.926 0.464 1.999 1.151 99.2 99.2 113.6 0.742 0.067 1.928 -0.189 1.999 0.955 99.2 99.2 114.4 0.741 0.188 1.927 -0.191 1.999 0.955 99.2 99.2 115.2 0.74 0.184 1.891 -0.193 1.999 0.954 99.2 99.2 116 0.754 0.181 1.893 -0.205 1.999 0.948 99.2 99.2 116.8 0.835 0.283 1.894 -0.206 1.999 0.933 99.2 99.2 117.6 0.835 0.709 1.892 -0.2 1.999 0.933 99.2 99.2 118.4 0.837 0.71 1.885 -0.035 1.999 0.945 99.2 99.2 119.2 0.85 0.716 1.886 -0.035 1.999 0.984 99.2 99.2 120 0.85 0.749 1.862 -0.035 1.999 0.984 99.2 99.2 120.8 0.849 0.749 1.78 -0.012 1.999 0.993 99.2 99.2 121.6 0.811 0.693 1.781 0.042 1.999 1.031 99.2 99.2 122.4 0.81 0.136 1.789 0.043 1.999 1.031 99.2 99.2 123.2 0.81 0.132 1.823 0.025 1.999 1.029 99.2 99.2 124 0.802 0.135 1.824 -0.031 1.999 1.009 99.2 99.2 124.8 0.785 0.191 1.827 -0.031 1.999 1.009 99.2 99.2 125.6 0.785 0.188 1.844 -0.034 1.999 1.008 99.2 99.2 126.4 0.786 0.196 1.845 -0.046 1.999 0.991 99.2 99.2 127.2 0.791 0.63 1.846 -0.046 1.999 0.991 99.2 99.2 128 0.791 0.63 1.848 -0.047 1.999 0.991 99.2 99.2 128.8 0.79 0.63 1.839 -0.047 1.999 0.991 99.2 99.2 129.6 0.79 0.63 1.811 -0.02 1.999 0.995 99.2 99.2 130.4 0.825 0.59 1.812 0.054 1.999 1.018 99.2 99.2 131.2 0.825 0.215 1.814 0.054 1.999 1.018 99.2 99.2 132 0.825 0.212 1.819 0.046 1.999 1.017 99.2 99.2 132.8 0.824 0.209 1.82 0 1.999 0.999 99.2 99.2 133.6 0.82 0.132 1.82 0 1.999 0.999 99.2 99.2 134.4 0.82 0.129 1.814 0.002 1.999 0.999 99.2 99.2 135.2 0.822 0.126 1.815 0.031 1.999 1 99.2 99.2 136 0.835 0.141 1.816 0.031 1.999 1.003 99.2 99.2 136.8 0.835 0.204 1.817 0.031 1.999 1.003 99.2 99.2 137.6 0.835 0.202 1.819 0 1.999 1 99.2 99.2 138.4 0.845 0.249 1.82 -0.085 1.999 0.983 99.2 99.2 139.2 0.845 0.605 1.798 -0.086 1.999 0.983 99.2 99.2 140 0.845 0.605 1.691 -0.081 1.999 0.983 99.2 99.2 140.8 0.844 0.605 1.691 -0.054 1.999 0.994 99.2 99.2 141.6 0.84 0.581 1.689 -0.055 1.999 0.994 99.2 99.2 142.4 0.84 0.58 1.645 -0.059 1.999 0.994 99.2 99.2 143.2 0.842 0.58 1.645 -0.12 1.999 0.989 99.2 99.2 144 0.855 0.593 1.645 -0.12 1.999 0.972 99.2 99.2 144.8 0.855 0.645 1.651 -0.121 1.999 0.972 99.2 99.2 145.6 0.855 0.645 1.672 -0.108 1.999 0.974 99.2 99.2 146.4 0.86 0.65 1.672 -0.074 1.999 0.984 99.2 99.2 147.2 0.86 0.685 1.667 -0.074 1.999 0.984 99.2 99.2 148 0.86 0.685 1.637 -0.064 1.999 0.985 99.2 99.2 148.8 0.859 0.685 1.637 -0.019 1.999 0.996 99.2 99.2 149.6 0.855 0.689 1.637 -0.02 1.999 0.996 99.2 99.2 150.4 0.855 0.69 1.645 -0.017 1.999 0.996 99.2 99.2 151.2 0.855 0.69 1.645 0.004 1.999 0.998 99.2 99.2 152 0.855 0.691 1.645 0.004 1.999 1.003 99.2 99.2 152.8 0.855 0.695 1.645 0.004 1.999 1.003 99.2 99.2 153.6 0.855 0.695 1.645 0.005 1.999 1.004 99.2 99.2 154.4 0.855 0.696 1.645 0.008 1.999 1.007 99.2 99.2 155.2 0.855 0.699 1.645 0.008 1.999 1.007 99.2 99.2 156 0.855 0.7 1.645 0.014 1.999 1.007 99.2 99.2 156.8 0.854 0.7 1.645 0.05 1.999 1.022 99.2 99.2 157.6 0.85 0.704 1.646 0.051 1.999 1.022 99.2 99.2 158.4 0.85 0.705 1.668 0.049 1.999 1.023 99.2 99.2 159.2 0.85 0.705 1.668 0.035 1.999 1.021 99.2 99.2 160 0.85 0.704 1.668 0.035 1.999 1.018 99.2 99.2 160.8 0.85 0.7 1.659 0.034 1.999 1.018 99.2 99.2 161.6 0.85 0.7 1.641 0.019 1.999 1.015 99.2 99.2 162.4 0.85 0.7 1.641 0.019 1.999 1.009 99.2 99.2 163.2 0.85 0.7 1.646 0.019 1.999 1.009 99.2 99.2 164 0.849 0.7 1.66 -0.008 1.999 1.008 99.2 99.2 164.8 0.845 0.699 1.66 -0.008 1.999 1.002 99.2 99.2 165.6 0.845 0.695 1.657 -0.008 1.999 1.002 99.2 99.2 166.4 0.846 0.695 1.645 -0.073 1.999 0.99 99.2 99.2 167.2 0.86 0.702 1.645 -0.256 1.999 0.922 99.2 99.2 168 0.86 0.759 1.812 -0.257 1.999 0.922 99.2 99.2 168.8 0.86 0.759 2.822 0.122 1.999 0.963 99.2 99.2 169.6 0.654 0.76 2.828 1.891 1.999 1.989 99.2 99.2 170.4 0.025 0.591 2.781 1.901 1.999 1.994 99.2 99.2 171.2 0.021 0.051 1.86 1.757 1.999 1.999 99.2 99.2 172 0.126 0.048 1.861 0.196 1.999 1.791 99.2 99.2 172.8 0.737 0.046 1.862 0.197 1.999 1.077 99.2 99.2 173.6 0.736 0.05 1.863 0.198 1.999 1.077 99.2 99.2 174.4 0.735 0.069 1.812 0.196 1.999 1.077 99.2 99.2 175.2 0.738 0.066 1.683 0.05 1.999 1.065 99.2 99.2 176 0.825 0.073 1.684 0.05 1.999 1.011 99.2 99.2 176.8 0.825 0.129 1.676 0.051 1.999 1.011 99.2 99.2 177.6 0.825 0.127 1.645 0.024 1.999 1.008 99.2 99.2 178.4 0.836 0.137 1.645 -0.054 1.999 0.983 99.2 99.2 179.2 0.865 0.655 1.647 -0.055 1.999 0.983 99.2 99.2 180 0.865 0.655 1.668 -0.069 1.999 0.982 99.2 99.2 180.8 0.866 0.655 1.668 -0.162 1.999 0.95 99.2 99.2 181.6 0.87 0.655 1.668 -0.163 1.999 0.95 99.2 99.2 182.4 0.87 0.655 1.668 -0.163 1.999 0.95 99.2 99.2 183.2 0.87 0.655 1.658 -0.164 1.999 0.95 99.2 99.2 184 0.87 0.655 1.621 -0.17 1.999 0.949 99.2 99.2 184.8 0.865 0.657 1.621 -0.19 1.999 0.945 99.2 99.2 185.6 0.865 0.685 1.621 -0.191 1.999 0.945 99.2 99.2 186.4 0.865 0.685 1.618 -0.191 1.999 0.944 99.2 99.2 187.2 0.865 0.685 1.61 -0.088 1.999 0.967 99.2 99.2 188 0.855 0.644 1.61 0.159 1.999 1.077 99.2 99.2 188.8 0.855 0.109 1.61 0.16 1.999 1.077 99.2 99.2 189.6 0.855 0.107 1.618 0.149 1.999 1.074 99.2 99.2 190.4 0.854 0.106 1.617 0.089 1.999 1.009 99.2 99.2 191.2 0.85 0.161 1.619 0.089 1.999 1.009 99.2 99.2 192 0.85 0.159 1.649 0.09 1.999 1.009 99.2 99.2 192.8 0.85 0.157 1.649 0.038 1.999 1.005 99.2 99.2 193.6 0.853 0.176 1.648 -0.128 1.999 0.966 99.2 99.2 194.4 0.86 0.585 1.649 -0.129 1.999 0.966 99.2 99.2 195.2 0.86 0.585 1.652 -0.114 1.999 0.967 99.2 99.2 196 0.86 0.585 1.652 -0.054 1.999 0.988 99.2 99.2 196.8 0.86 0.59 1.652 -0.055 1.999 0.988 99.2 99.2 197.6 0.86 0.59 1.652 -0.049 1.999 0.988 99.2 99.2 198.4 0.86 0.59 1.652 -0.02 1.999 0.996 99.2 99.2 199.2 0.86 0.59 1.652 -0.02 1.999 0.996 99.2 99.2 200 0.86 0.59 1.649 -0.017 1.999 0.996 99.2 99.2 200.8 0.859 0.59 1.649 0.011 1.999 1 99.2 99.2 201.6 0.855 0.59 1.648 0.012 1.999 1.011 99.2 99.2 202.4 0.855 0.59 1.636 0.012 1.999 1.011 99.2 99.2 203.2 0.855 0.59 1.598 0.011 1.999 1.01 99.2 99.2 204 0.855 0.59 1.598 0.008 1.999 1.007 99.2 99.2 204.8 0.855 0.595 1.604 0.008 1.999 1.007 99.2 99.2 205.6 0.855 0.595 1.645 0.005 1.999 1.008 99.2 99.2 206.4 0.851 0.595 1.645 -0.008 1.999 1.029 99.2 99.2 207.2 0.835 0.617 1.645 -0.008 1.999 1.029 99.2 99.2 208 0.835 0.69 1.638 -0.008 1.999 1.029 99.2 99.2 208.8 0.835 0.69 1.621 0.029 1.999 1.038 99.2 99.2 209.6 0.84 0.637 1.621 0.117 1.999 1.091 99.2 99.2 210.4 0.84 0.099 1.633 0.117 1.999 1.091 99.2 99.2 211.2 0.84 0.097 1.695 0.365 1.999 1.154 99.2 99.2 212 0.639 0.094 1.695 1.273 1.999 1.991 99.2 99.2 212.8 0.029 0.04 1.715 1.278 1.999 1.995 99.2 99.2 213.6 0.026 0.038 1.959 1.173 1.999 1.999 99.2 99.2 214.4 0.145 0.035 1.96 0.263 1.999 1.746 99.2 99.2 215.2 0.736 0.042 1.961 0.265 1.999 1.094 99.2 99.2 216 0.735 0.068 1.874 0.266 1.999 1.094 99.2 99.2 216.8 0.741 0.066 1.66 0.203 1.999 1.082 99.2 99.2 217.6 0.84 0.146 1.66 0.054 1.999 1.013 99.2 99.2 218.4 0.84 0.705 1.902 0.055 1.999 1.013 99.2 99.2 219.2 0.84 0.705 2.945 0.377 1.999 1.093 99.2 99.2 220 0.602 0.676 2.95 1.534 1.999 1.992 99.2 99.2 220.8 0.044 0.044 2.832 1.54 1.999 1.996 99.2 99.2 221.6 0.041 0.042 1.905 1.328 1.999 1.964 99.2 99.2 222.4 0.217 0.041 1.906 0.241 1.999 1.089 99.2 99.2 223.2 0.721 0.079 1.888 0.242 1.999 1.089 99.2 99.2 224 0.72 0.077 1.683 0.206 1.999 1.087 99.2 99.2 224.8 0.744 0.076 1.684 0.015 1.999 1.002 99.2 99.2 225.6 0.825 0.144 1.683 0.016 1.999 1.002 99.2 99.2 226.4 0.825 0.142 1.672 0.009 1.999 1.002 99.2 99.2 227.2 0.832 0.14 1.672 -0.035 1.999 1 99.2 99.2 228 0.865 0.149 1.672 -0.035 1.999 0.994 99.2 99.2 228.8 0.865 0.177 1.654 -0.039 1.999 0.994 99.2 99.2 229.6 0.865 0.176 1.614 -0.132 1.999 0.986 99.2 99.2 230.4 0.86 0.249 1.613 -0.132 1.999 0.957 99.2 99.2 231.2 0.86 0.6 1.613 -0.133 1.999 0.957 99.2 99.2 232 0.86 0.6 1.614 -0.115 1.999 0.96 99.2 99.2 232.8 0.86 0.601 1.613 -0.066 1.999 0.988 99.2 99.2 233.6 0.86 0.605 1.617 -0.066 1.999 0.988 99.2 99.2 234.4 0.86 0.605 1.641 -0.045 1.999 0.989 99.2 99.2 235.2 0.86 0.604 1.641 0.035 1.999 1.014 99.2 99.2 236 0.86 0.566 1.638 0.035 1.999 1.014 99.2 99.2 236.8 0.86 0.565 1.602 0.034 1.999 1.014 99.2 99.2 237.6 0.859 0.565 1.602 0.027 1.999 1.014 99.2 99.2 238.4 0.855 0.564 1.602 0.027 1.999 1.014 99.2 99.2 239.2 0.855 0.56 1.615 0.022 1.999 1.014 99.2 99.2 240 0.849 0.56 1.649 -0.155 1.999 1.016 99.2 99.2 240.8 0.795 0.461 1.648 -0.156 1.999 1.021 99.2 99.2 241.6 0.795 0.023 1.785 -0.156 1.999 1.021 99.2 99.2 242.4 0.789 0.021 2.185 0.011 1.999 1.046 99.2 99.2 243.2 0.711 0.026 2.187 0.377 1.999 1.155 99.2 99.2 244 0.71 0.058 2.081 0.379 1.999 1.155 99.2 99.2 244.8 0.712 0.056 1.734 0.31 1.999 1.14 99.2 99.2 245.6 0.79 0.059 1.734 0.117 1.999 1.037 99.2 99.2 246.4 0.79 0.098 1.723 0.117 1.999 1.037 99.2 99.2 247.2 0.79 0.096 1.66 0.092 1.999 1.034 99.2 99.2 248 0.81 0.099 1.66 0 1.999 0.999 99.2 99.2 248.8 0.86 0.178 1.658 0 1.999 0.999 99.2 99.2 249.6 0.86 0.177 1.645 -0.013 1.999 0.999 99.2 99.2 250.4 0.851 0.175 1.645 -0.093 1.999 0.968 99.2 99.2 251.2 0.762 0.153 1.65 -0.094 1.999 0.968 99.2 99.2 252 0.762 0.065 1.846 -0.081 1.999 0.968 99.2 99.2 252.8 0.761 0.063 1.846 0.185 1.999 0.985 99.2 99.2 253.6 0.761 0.061 1.847 0.186 1.999 1.07 99.2 99.2 254.4 0.761 0.061 1.847 0.187 1.999 1.07 99.2 99.2 255.2 0.76 0.079 1.817 0.187 1.999 1.07 99.2 99.2 256 0.76 0.077 1.633 0.156 1.999 1.066 99.2 99.2 256.8 0.786 0.075 1.633 0.012 1.999 1.003 99.2 99.2 257.6 0.86 0.168 1.632 0.012 1.999 1.003 99.2 99.2 258.4 0.86 0.167 1.61 0.01 1.999 1.003 99.2 99.2 259.2 0.86 0.165 1.61 -0.019 1.999 1.001 99.2 99.2 260 0.86 0.187 1.61 -0.02 1.999 0.993 99.2 99.2 260.8 0.86 0.323 1.609 -0.02 1.999 0.993 99.2 99.2 261.6 0.86 0.322 1.616 -0.02 1.999 0.993 99.2 99.2 262.4 0.86 0.321 1.652 -0.058 1.999 0.99 99.2 99.2 263.2 0.86 0.325 1.652 -0.229 1.999 0.939 99.2 99.2 264 0.86 0.635 1.655 -0.23 1.999 0.938 99.2 99.2 264.8 0.86 0.635 1.691 -0.219 1.999 0.938 99.2 99.2 265.6 0.859 0.635 1.691 -0.113 1.999 0.958 99.2 99.2 266.4 0.855 0.522 1.691 -0.113 1.999 1.011 99.2 99.2 267.2 0.855 0.162 1.686 -0.113 1.999 1.011 99.2 99.2 268 0.854 0.161 1.672 -0.037 1.999 1.015 99.2 99.2 268.8 0.845 0.153 1.672 0.136 1.999 1.035 99.2 99.2 269.6 0.845 0.113 1.67 0.137 1.999 1.035 99.2 99.2 270.4 0.845 0.111 1.664 0.099 1.999 1.03 99.2 99.2 271.2 0.847 0.117 1.664 -0.023 1.999 0.988 99.2 99.2 272 0.85 0.272 1.661 -0.023 1.999 0.988 99.2 99.2 272.8 0.85 0.271 1.641 -0.036 1.999 0.988 99.2 99.2 273.6 0.851 0.277 1.641 -0.089 1.999 0.983 99.2 99.2 274.4 0.855 0.575 1.639 -0.09 1.999 0.983 99.2 99.2 275.2 0.855 0.575 1.621 -0.081 1.999 0.983 99.2 99.2 276 0.855 0.575 1.621 0.008 1.999 0.989 99.2 99.2 276.8 0.85 0.569 1.621 0.008 1.999 1.007 99.2 99.2 277.6 0.85 0.541 1.624 0.008 1.999 1.007 99.2 99.2 278.4 0.85 0.54 1.633 0.015 1.999 1.008 99.2 99.2 279.2 0.845 0.535 1.633 0.035 1.999 1.018 99.2 99.2 280 0.845 0.486 1.635 0.035 1.999 1.018 99.2 99.2 280.8 0.845 0.485 1.649 0.042 1.999 1.018 99.2 99.2 281.6 0.843 0.479 1.648 0.074 1.999 1.026 99.2 99.2 282.4 0.835 0.099 1.65 0.074 1.999 1.026 99.2 99.2 283.2 0.835 0.097 1.672 0.07 1.999 1.026 99.2 99.2 284 0.835 0.095 1.672 0.031 1.999 1.023 99.2 99.2 284.8 0.831 0.11 1.672 0.031 1.999 1.013 99.2 285.6 0.831 0.24 1.665 0.031 1.999 1.013 99.2 286.4 0.83 0.239 1.618 0.023 1.999 1.011 99.2 287.2 0.83 0.238 1.618 -0.023 1.999 0.991 99.2 288 0.83 0.237 1.618 -0.023 1.999 0.991 99.2 288.8 0.83 0.236 1.617 -0.023 1.999 0.991 99.2 289.6 0.83 0.261 1.617 -0.023 1.999 0.991 99.2 290.4 0.83 0.561 1.622 -0.023 1.999 0.991 99.2 291.2 0.83 0.561 1.664 -0.023 1.999 0.991 99.2 292 0.83 0.56 1.664 1.999 99.2 292.8 0.56 1.664 1.999 99.2 293.6 0.56 1.664 1.999 99.2 294.4 1.664 1.999

Hi folks, Just a brief update in case this is of value. As a precursor, I did watch of few of the videos and they are excellent. Simple explanations for fairly complex subjects. Thanks folks for your verification of part number and other hints, which I need to try. On Saturday (60F here and sunny), I drove the vehicle for approx., 4 miles only to have the P0130 code appear again. I cleared the fault, stopped for 15 minutes, drove another approx. 4 miles and the same thing happened. This process repeated two other times with the vehicle resting anywhere from 1 hour to zero minutes. I was trying to gauge if it was related to temperature of the engine and/or exhaust system but I could not find a positive correlation. On Sunday, I decided that I would clean the MAF sensor and also look at my K&N air filter for excess oil. The filter appeared fine (no dripping oil) and I cleaned the MAF for approx. 5 minutes. I had the engine running while spraying the MAF simply to see the reaction. As expected, the engine stumbled and then regained normal operation a few seconds after. I also sprayed electronic cleaner on the 02 connector in the engine bay, let it evaporate and then reconnected it. I then took the vehicle for a drive of 50 miles. I tried many driving conditions - steady pace at 55 mph, fast acceleration from a stop getting the boost past 0.8 bar and then immediately letting off of the throttle (to perhaps test the blow-off valve), normal city stop and go traffic, etc. It did not fail so I thought that I had solved the problem. Low and behold, I park the car overnight, drive two miles (about 55F ambient air but engine "cold") and the P0130 code appears. It's been doing this for the past two days just about every time I start the car, whether it's cold or at full operating temperature.

Hello Lewis and Boxzilla, First, thank you very much for your prompt responses! I am truly awed by the support in this forum and hope I can give back as much as people have given to me. 1) I will watch the video this evening 2) It is a Bosch with part number 955-606-126-02-M14.

Hi Folks, Here's an update. The frequency of the P0130 code has steadily increased to almost once every 15 miles. I keep resetting it with my diagnostic tester but it keeps coming back, as expected. I took it to a local shop that specializes in Porsches and is recommended in this and other sites as a trusted PPI shop and for repairs. They did a more comprehensive data logging and graphing and found that this sensor compared to the same pre-cat sensor on the driver side reacted a bit differently in that the suspect sensor (one causing the P0130 code) reacted a bit slower under certain driving conditions. They also did a physical inspection of the connectors and general listen for exhaust leaks. They decided to replace the O2 sensor (same model number as the one I purchased in May), test drove it, looked at data and deemed the problem to be solved. I drove it home last night, filled the gas tank (was nearly empty) and parked it. No problems were observed. I drove two miles this morning (about 30F outside, little humidity) and the CEL came on with the code being P0103 - same as before. Now, I do have an aftermarket cold air intake with K&N "pyramidal" filters, silicone inlet tubes and an IPD plenum all from a previous owner, two owners ago. It also has an aftermarket tune, again from two owners ago. Could any of these items be a contributor to the issue? I do not see any correlation to any factor (cold or warm engine, full or partial throttle, cold or warm air temperature (at least not until it warms up again and if frequency decreases), etc.) yet. The shop will continue to research the issue by calling their Porsche regional representative and are eager to solve the problem with good old rational thinking before rip&replace of massive amounts of parts - in other words, they seem to be taking a prudent approach. Any further thoughts, hints, prayers to the Stuttgart gods are most welcome! Thanks, Jim

Loren, Thanks for the suggestions and I will look into it being an exhaust system leak.

Dear Forum, I have a 2004 Cayenne Turbo with 87k miles on it. I purchased it used in February and encountered the P0130 code in late April. I replaced the bank 1, sensor 1 02 sensor (passenger side, in front of catalytic converter) in mid-May, cleared the code and all was well until now. The code has re-appeared after approximately 150 miles since replacement. Hs anyone experienced a similar issue of a P0130 code soon after the O2 sensor replacement? I welcome all suggestions. FYI - in an attempt to give back to this good community, I did post my replacement procedure in this forum. Some additional background: 1) vehicle was purchased with cat bypasses for both secondary cat's. 2) vehicle passed Illinois emissions before I purchased it 3) vehicle passed PPI before I purchased it 4) vehicle was purchased with an ECU tune from EP labs Thanks in advance!

Hi Everyone, Well, I finally managed to purchase my first Porsche - a 2004 Turbo Cayenne with 86k miles and most of the normal out of warranty work already done (coolant tubes, cardan shaft, etc) and am thrilled to be a member of the Porsche community! Prior to purchasing it, I read through many articles on Porsche ownership to get an idea of normal problems and remedies. Renntech has been a treasure of information and I would now like to give back a little bit to the community. The dreaded CEL arose after 2 months of ownership and I took the CTT into O'Reillys (thanks O'Reillys) to get a fault code read out. It showed that my passenger side pre-cat O2 sensor was bad so I order a new one and proceeded to read through as many DIY articles as I could find on the topic. This one and the one on Pelican Parts were most helpful and are what I used as my basis. My initial plan was to remove the inner wheel well per sswong98"s good details above. I started down this path, took off the wheel and decided to take a peek underneath before removing the wheel well simply to assess how much room I had to work with. To make a long story short, I ended up being able to remove and replace the O2 sensor within the very confined space given and without removing the wheel well. In all, it took 90 minutes after jostling about quite a bit and trying different tools. I thought this might be another alternative of value to offer to this community so I'll describe it briefly here. 1) Follow SSwong98's steps of: a) jack up vehicle B) turn wheels right ​to wheel lock c) remove front passenger tire d) remove 02 sensor electrical connection at firewall. At this point you can see how much room I had to work with between the body, suspension, etc. The photo with the end of the 3/8 ratchet extension shows where to view and then subsequent photos show the amount of clearance and the 02 sensor. Basically, I was able to use a 22mm open ended wrench and get it into the space shown in the photos. Lying on my back, I was able to get the wrench between the suspension and inner wheel well and break the 0@ sensor loose. Once I had it broken loose, I could use my fingers to unscrew the O2 sensor, again lying on my back and from underneath the vehicle. Unscrewing the )2 sensor was not difficult but took about 5 minutes as I could only turn it slightly, then re-grip the sensor so that the wire did not cause it to screw back in, and then continue this process until it was removed. I could have also cut the sensor wire which would have eliminated some of the torque produced by the wire and made it slightly easier to unscrew the sensor. Once the sensor was out, I removed the original heat shield from the original O2 sensor wire by cutting it lengthwise. My goal was to reuse it on the new sensor. I then drilled 4 small pilot holes on both side of this heat shield (sorry, forgot to take photos) and placed a pop rivet into each in order to have it hold in place around the O2 sensor wire. The most challenging part was getting the new 02 sensor started into the mounting hole. I dropped the sensor in from the top of the engine and was able to locate the sensor quite easily. I was also able to reach up from underneath the vehicle, grasp the sensor with a thumb and finger and get the O2 sensor into the mounting hole. However, once again, the sensor wire created a torque that prevented me from being able to start the sensor correctly into the threading. After trying various options for 5 minutes, I called in the calvary... I asked my son to hold the sensor wire from the engine bay side and to turn the wire slightly in a clockwise manner so that the sensor wire torque worked in my favor. I also repositioned myself so that I could get a much better grasp of the sensor. Instead on lying on my back looking up at the sensor, I sat down in front of the caliper and was able to reach the sensor through the same opening as before. While I could not see the sensor, I had it placed into the mounting hole from before so all I needed to do was to get it to start threading properly. In this seated in front of the caliper position, I was able to much more easily grasp and turn the sensor and got it threaded within a few seconds. At the same time, I told my son to slowly keep tuning the sensor wire. Once the sensor was hand tight, I used the 22mm open ended wrench to tighten it. All told, it took about 90 minutes from wheels up to wheels down. Some other notes: I ordered the special O2 sensor socket from Pelican (same one shown in SSWONG98's write up) but, very oddly, could not get enough room from the top or bottom to be able to get it onto the sensor. Removing the inner fender well would have helped here. I also would suggest getting a stubby 22mm open ended wrench as this would allowed more freedom for movement. The one I had was about 14 inches long. I also had a line wrench (shown in one photo) that was a bit shorter in length and worked very well. Well, I hope that this is some value to this great community