P0156

P0156

Oxygen Sensor After TWC, Bank 2 - Signal Implausible

Diagnosis conditions
- Battery positive voltage between 10 V and 16 V
- Time elapsed after engine start-up greater than 10 seconds
- Exhaust temperature < 800 °C

Possible fault cause
- Pinching damage on wiring harness (no short circuit)
- Oxygen sensor faulty (heating connection)

Affected pin
DME control module connector A, pin 6, and oxygen sensor after TWC, bank 2, pin 2
DME control module connector A, pin 10, and oxygen sensor after TWC, bank 2, pin 3
DME control module connector A, pin 11, and oxygen sensor after TWC, bank 2, pin 4

Diagnosis/troubleshooting

NOTE: Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).

NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor after catalytic converter as this will cause implausible fault entries.

Distinguishing feature of both sensors:

Oxygen sensor ahead of catalytic converter (LSU) has a 6-pole connector






Oxygen sensor after catalytic converter (LSF) has a 4-pole connector