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Old 10-24-2009, 08:54 AM   #1
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Join Date: Mar 2009
Location: Scotland
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Help with OBD2 Code P 2096

I have just downloaded the following OBD 2 code : P2096 ( Post catalyst fuel trim system to lean bank 1 ) from my 2003 3.2 S which had just illuminated the CEL. No other codes and no pending codes. Car continues to start and run sweet as without any obvious signs of a problem.

I have researched boxster codes and can't find anything numerically above P1900's. ( ie first digit "zero" for generic and "one" for manufacturer specific.)

I read somewhere that sometimes generic codes have to be cross referenced with a porsche OBD2 manual for full understanding of underlying fault. Where can I get this information and / or does Bentleys contain an exhaustive list or just the most commonly used.

A slightly vague 996/ 997 thread suggested that this is simply an advanced indication of an ageing rear O2 sensor (on its way out). Hence reset CEL and continue to run the car. If it reoccurs then change O2 sensor.

As always thanks for your technical prowess !
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Old 10-24-2009, 08:59 AM   #2
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Location: San Antonio, Texas!
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found this on 6speed:

P2096
Signal Delay Time for Oxygen Sensor Ageing Limit
Diagnosis conditions
Oxygen sensing after TWC is active
No secondary air
No diagnosis of secondary air system
EVAP canister not highly loaded
No faults in memory
Possible fault cause
♦ Oxygen sensor


Looks like he ended up having a failed catalytic converter and dealer replaced it under warranty.
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