0774

The signal of the oxygen sensor upstream of the catalytic converter of the right cylinder bank is shifted towards 'Rich'. (P2A00)

Test 1: Check exhaust system for leaks.

Test 2: Check self-adaptation of mixture formation.

Test 3: Check component G3/4 (Right O2 sensor, before TWC [KAT]).

Test 4: Possible cause:

- G3/4 (Right O2 sensor, before TWC [KAT])
- Selfadaptation of mixture formation
Affected functions:

- Engine diagnosis
- Exhaust system

1. Check exhaust system for leaks.
Possible cause of fault

- Leakage on catalytic converter at flange connection to exhaust manifold and in area of O2 sensor
Possible remedy

- Check O2 sensor for correct seating, tightening torque and leaktightness.
- Check weld seams on catalytic converter for leaktightness.
End of test

2. Check self-adaptation of mixture formation.
Test sequence

- Check actual value Selfadaptation of mixture formation.
- Carry out the following tests.
Continue with button F2

Warning!Communication with ECU required.


3. Check component G3/4 (Right O2 sensor, before TWC [KAT]).
Warning!Communication with ECU required.


4. No further information available.