P0155

P0155

Diagnosis information - DME V6 DFI

Heater circuit, oxygen sensor ahead of cat. converter, 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
- Battery positive voltage between 10 V and 16 V
- Time after engine starts > 10 seconds
- Exhaust temperature over 600 °C (1,112 °F)
- Oxygen sensor heater control active
- No driver fault of oxygen sensor stored

Possible fault causes
- Oxygen sensor faulty
- Contact resistance between DFI control unit and oxygen sensor heater ahead of catalytic converter, bank 2
- Contact resistance between fuse FE 17 (fuse carrier in plenum panel E-box) and oxygen sensor heater ahead of catalytic converter, bank 2
- High resistance shunt to signal line

Affected contacts on the DFI control unit connector
Connector [B]:
- Contact 73

Affected contacts on the oxygen sensor connector ahead of catalytic converter, bank 2
- Contact 3