Fault codes 2A01 2096

[Doug_B_928]

I checked for faults on my 2008 957S to assist EMC2 with a question, and ended up finding some faults about which I wasn't aware.  Here's a snip of the Durametric output for the Engine Module:

 

 

Can someone please tell me what these suggest?

[Loren]

P2A01 Fuel trim deviation downstream of catalytic converter, bank X

 

Possible fault causes

- Fault in fuel/air mixture

- Fault in exhaust pipe

- Fault in exhaust measurement

- Other faults are stored in the fault memory

 

P2096 Lambda correction behind catalytic converter, bank 1 - lean I rich control limit exceeded

 

Possible fault causes

- Leak in exhaust system between the two oxygen sensors on bank 1

- Tank vent stuck in open position

- Secondary air before intake valve

- Fault in intake camshaft

- Valve lift error

- Mechanical fault in valve drive

- Oxygen sensor ahead of catalytic converter, bank 1 faulty (old)

 

I would start looking for air leaks.

[Doug_B_928]

Thanks, Loren.  Can you please elaborate a bit on looking for air leaks?  Are you referring to a leakdown test?

[Loren]

Intake and/or exhaust leaks.

Use of a smoke machine would likely help -if you can find a shop that has one.

[basadaniels]

You could also add the Mass Air Flow sensor. Check your fuel trims, disconnect connectors to each MAF and re-check, if there is no difference then a likely culprit.

[Zuffenhausen955]

Cayenne with air suspension has an air line, in-line filter, to clean the incoming pump air. If this filter comes off the mounting "straw" off the bank1 (passenger) air box - the P2096 code will manifest itself.