P0157

P0157

Diagnosis information - DME V6 DFI

Oxygen sensor behind cat. conv., bank 2

NOTE: Do not use contact spray on the oxygen sensor's plug connections as this will result in irreparable damage to the lines (blockage of reference air duct).

NOTE: Do not interchange the oxygen sensor ahead of catalytic converter with the sensor behind the catalytic converter as this will result in implausible fault entries.

Diagnostic conditions
- Exhaust temperature between 350 °C (662 °F) and 890 °C (1,634 °F)
- Battery positive voltage between 11 V and 16 V
- Engine idling for 3,000 seconds after start
- Coolant temperature between 40 °C and 60 °C (104 °F and 140 °F)
- No secondary air
- No secondary air diagnosis
- No tank ventilation
- No tank ventilation diagnosis
- No other faults stored

Possible fault causes
- Short to ground in signal line
- Inter-core short circuit
- Oxygen sensor faulty (short circuit)

Affected contacts on the DFI control unit connector
Connector [B]:
- Contact 54
- Contact 55

Affected contacts on the oxygen sensor connector behind catalytic converter, bank 1
Connector [A]:
- Contact 3
- Contact 4