P0031
P0031Diagnosis information - DME (DFI)
Oxygen sensor heater driver ahead of catalytic converter, bank 1
NOTE: Do not use contact spray on the oxygen sensor plug connections, as this will cause irreparable damage to the lines (blockage of reference air duct).
NOTE: Do not interchange oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.
Diagnostic conditions
- Vehicle voltage more than 9 V
- Engine running more than 10 seconds
- Oxygen sensor heater ahead of catalytic converter active
Possible fault causes
- Short circuit to B+
- Short circuit to ground
- Open circuit
- Fuse faulty
- Loose contact in connector
- Oxygen sensor faulty