[skyotee]

I have been dealing with the dreaded rough idle for a while now, can't seem to cure it. Walnut blasting, new plugs, cleaning throttle body, VANOS solenoids, and boost & TMAP sensors have not helped. Also all new coils.

Anyway, I had a really long cold start this evening, and the check engine light came on. Codes are:

2C9C Lambda probe heating in front of catalytic converter, input signal
2CAA Lambda probe before catalyst, temperature
2CA6 Lambda probe heating in front of catalytic converter, function

Any ideas?! I am on stock DPs.

[ferocity02]

Could be a bad O2 sensor.

[BashShah]

Originally Posted by skyotee

I have been dealing with the dreaded rough idle for a while now, can't seem to cure it. Walnut blasting, new plugs, cleaning throttle body, VANOS solenoids, and boost & TMAP sensors have not helped. Also all new coils.

Anyway, I had a really long cold start this evening, and the check engine light came on. Codes are:

2C9C Lambda probe heating in front of catalytic converter, input signal
2CAA Lambda probe before catalyst, temperature
2CA6 Lambda probe heating in front of catalytic converter, function

Any ideas?! I am on stock DPs.

Did you ever Figure this out?
I have 2C9C.....wont go away.

Happens after I took Traction Control off, and drove extremely hard in the Snow to make it up a Hill.
Stalled in reverse once, temp was really high....then waited a bit, and started right back up.

Cleared codes, and now I have 3 codes. That are givng me a Chech engine light.

Help would be appreciated.
Best Regards, and Happy New Year.

[skyotee]

Yes, the Lambda codes were a faulty pre-cat O2 sensor. As for my rough idle, probably a combo of leaky injectors and a faulty HPFP, although the HPFP was probably the main culprit. Anyway, if you are just throwing the Lambda codes, probably have a bad O2 sensor.