Hi:

2003 A6 Quattro 4.2L. 134 k

Check engine light on

OBD codes P0441, P2096, P2098

P0441 Audi
P0441 Audi - EVAP System Incorrect Purge Flow

Possible causes
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

Read more: P0441 Audi EVAP System Incorrect Purge Flow OBDII Engine Light Trouble Code | Engine-Codes.com


P2096 Audi
P2096 Audi - Post Catalyst Fuel Trim System Too Lean

Possible causes
- Low fuel pressure
- Misfire condition
- Large vacuum leak
- Air leak near sensor
- Plugged catalytic converter
- Lean air/fuel ratio
- Faulty front O2 sensor


P2098 Audi
P2098 Audi - Post Catalyst Fuel Trim System Too Lean Bank 2


Possible causes
- Low fuel pressure
- Engine misfire
- Large vacuum leak
- Blocked converter
- Faulty O2 sensor bank 2



2096 says possible faulty front O2 sensor (no bank ID)
2098 says - possible faulty O2 sensor Bank 2 (front or rear)

There are no codes 1196 or 1198 or any other codes reported.

My question is: What does all this tell me?? Interrelated??

 

Fuel filler cap remains open or fails to close

I put on new fuel cap and all codes went away. Still don't understand relationship between leaking fuel cap and P2096/P2098. Anyone care to explain????

Best regards

 

oops. Drive about 30 miles. Parked started and check engine light back - P0441 but no P2096 or P2098. Cleared again.

How to track this down? I read somewhere that the solution is to take to dealer and they will change everything for a few thousand bucks.