Still get P0130 after replacing 02 sensor - any hints

[jweimer]

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!

[Loren]

P0130  Oxygen sensor in front of catalytic converter, bank 1 – signal implausible

 

Possible cause of fault

• Leaking bolts on oxygen sensor
• Leaks in exhaust system, between engine and catalytic converter
• Oxygen sensor in front of catalytic converter faulty (shift in characteristics/pollution)

I would start with looking for leaks in the exhaust system.

[jweimer]

Loren,

 

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

[jweimer]

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

[Guest]

I found this guys explanation of O2 diagnostics informative/exceptional. Hopefully it will help you understand what is going on in your situation.

https://youtu.be/XQYDwIWS6Ho

 

[lewisweller]

1 hour ago, jweimer said:

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

Whats the lambda sensor part number your using? Should be 0258007174 as the Bosch part number. 

 

[lewisweller]

1 hour ago, boxzilla said:

I found this guys explanation of O2 diagnostics informative/exceptional. Hopefully it will help you understand what is going on in your situation.

https://youtu.be/XQYDwIWS6Ho

 

This guy is good, I watched a lot of his videos.

 

One thing to note, the Porsche Cayenne precat lambda sensor produces a measurable milliamp current not voltage for the dme to read. Higher current means richer the mixture and less air is being sensed, lower current is lean mixture and more air sensed. The idea is that the dme should maintain a Lambda 1. Snap throttle will show rich higher current. The sensor should respond within 100ms and both sensors should look very similar when graphed.  

The post cat o2 sensor produces voltage. 

 

[jweimer]

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. 

[lewisweller]

1 hour ago, jweimer said:

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. 

Yes that is the correct sensor for our cars. 

 

The fault code relates to an electrical issue and considering this is a new sensor and Same fault it has to be either the wiring loom or dme issue. 

You could get the dme pin diagram and test resistance between plug pins and dme pins. 

[jweimer]

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.

[jweimer]

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

[jweimer]

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)

[Paul Julius]

I’m experiencing similar. Did you ever reach a solution to this issue @jweimer?

 

- PJ

 

[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"