The efficiency of the left catalytic converter is insufficient. (function chain) (P0422)

The efficiency of the left catalytic converter is insufficient. (function chain) (P0422)


Possible cause:

- Catalytic converter of left cylinder bank
Affected functions:

- Engine diagnosis
- Exhaust system

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Test 1: Effect of the catalytic converter for the left cylinder bank

1. Effect of the catalytic converter for the left cylinder bank

Test 1.1: Check component G3/3 (Left O2 sensor, before TWC [KAT]).

Test 1.2: Check component G3/5 (Left O2 sensor, after TWC [KAT]).

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


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