Mercedes Benz

P2254 G3/3 (Left O2 sensor, before TWC [KAT]) : Open circuit (P2254) Possible cause: ­ G3/3 (Left O2 sensor, before TWC [KAT]) Affected functions: ­ ­ Engine diagnosis Exhaust system ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ Test 1: Check component G3/3 (Left O2 sensor, before TWC [KAT]). 1. Check component G3/3 (Left O2 sensor, before TWC [KAT]). Warning!Communication with ECU required.