P0053

P0053

Diagnosis Information - DME (DFI)

Oxygen sensor ahead of catalytic converter, bank 1

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).
- 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
- Engine at operating temperature
- then drive for 2 minutes (incl. 1 overrun phase)
- then engine idling > 40 seconds

Possible fault causes
- Line short to heater circuit
- Oxygen sensor faulty