CEL is on

[Crystal Shine]

OBD II found fault code P1126. Could someone help me what is the problem?

My car is 2000 Boxster S with near 60,000 miles.

Thanks.

[Rodger]

P1126 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold

Sounds like maybe the left bank O2 sensor is failing. Typically when they go bad they make the car run rich.

<--could be wrong, wait for Loren's answer.

[Crystal Shine]

P1126 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold

Sounds like maybe the left bank O2 sensor is failing. Typically when they go bad they make the car run rich.

<--could be wrong, wait for Loren's answer.

I changed all (4) O2 sensors (after market) about 400 miles ago. The code was P1275 at that time.

Could that be MAF sensor?

[Loren]

It is not the O2 sensors and it is likely not the MAF. If it were the MAF why would your engine be running too lean only on cylinders 4-6?

I think you should look for intake leaks, a cracked oil filler hose, oil separator or other intake related problem.

[Crystal Shine]

P1126 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold

Sounds like maybe the left bank O2 sensor is failing. Typically when they go bad they make the car run rich.

<--could be wrong, wait for Loren's answer.

Rodger...Could you check code P1119 for me? What does it mean? I switched the O2 sensors between bank 1 and bank 2. Guessing one of the new sensor may be defective.

[Rodger]

P1119 Oxygen Sensor Heating 2 Ahead of Catalytic Converter - Below Lower Limit

If I am reading this right, it sounds like the O2 sensor closest to the head isn't heating up properly. Not sure which side is "side 2", though. Right bank is cylinders 1-3, so maybe it's the left bank (cyl. 4-6)?

Ask the experts!

[Loren]

http://www.renntech.org/forums/index.php?s...ost&p=55669