P0156

Oxygen sensor 2 (cylinder bank 2) has an electrical fault.


Possible cause:

- G3/5 (Left O2 sensor, after TWC [KAT])
- N10/1kC (Circuit 87 relay, engine)
- N10/1f23 (Fuse 23)
- Voltage supply via component Z7/36 (Circuit 87 M2e connector sleeve)
Affected functions:

- Engine diagnosis
- Exhaust system

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Test 1: Arrangement of fuses

Test 2: Power supply

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

1. Arrangement of fuses
Figure legend/figure

- N10/1 (Front SAM control unit with fuse and relay module)
Fuses

- FuseF21-F66
Relays

- K =N10/1kK (Wiper park position heater relay)
- J =N10/1kJ (Circuit 15 relay, starter)
- H =N10/1kH (Circuit 50 relay, starter)
- G =N10/1kG (Circuit 15R relay)
- F =N10/1kF (Fanfare horn relay)
- B =N10/1kB (Air suspension compressor relay)
- C =N10/1kC (Circuit 87 relay, engine)
- D =N10/1kD (Circuit 15 relay)
- E =N10/1kE (Circuit 87 relay, chassis)
- A =N10/1kA (Air pump relay)













2. Power supply

2. No further information available.


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