0777

The signal of the oxygen sensor upstream of the catalytic converter of the left cylinder bank is shifted towards 'Lean'. (P2A03)


Possible cause:

- The signal of the oxygen sensor upstream of the catalytic converter of the left cylinder bank is shifted towards 'Lean'.
Affected functions:

- Engine diagnosis
- Exhaust system

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Test 1: Check exhaust system for leaks.

Test 2: Check component G3/3 (Left O2 sensor, before TWC [KAT]).

Test 3: Check component G3/5 (Left O2 sensor, after TWC [KAT]).

1. Check exhaust system for leaks.
Warning!Communication with ECU required.


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


3. Check component G3/5 (Left O2 sensor, after TWC [KAT]).
Warning!Communication with ECU required.