P0031
P0031Diagnosis information - DME V6 DFI
Driver for oxygen sensor heater ahead of catalytic converter, bank 1
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 behind catalytic converter as this will cause implausible fault entries.
Diagnostic conditions
- Battery positive voltage between 9 V and 16 V
- Time after engine starts > 10 seconds
Possible fault causes
- Short circuit to B+
- Short circuit to ground
- Open circuit in line
- Fuse FE 17 faulty (fuse carrier in plenum panel E-box)
- Loose contact in connector
- Oxygen sensor heater faulty
- Oxygen sensor faulty
Affected contacts on the DFI control unit connector
Connector [B]:
- Contact 51
Affected contacts on the oxygen sensor connector behind catalytic converter, bank 1
- Contact 3