P0140

P0140

Diagnosis information - DME (DFI)

Oxygen sensor behind catalytic converter, bank 1, open circuit

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
- Perform short test [Oxygen sensor active test]

or (if no short test is possible):
- Engine at operating temperature
- then drive for 2 minutes
- then engine idling more than 30 seconds

Possible fault causes
- Open circuit in signal line and / or ground line of oxygen sensor
- Loose contact in connector
- Oxygen sensor behind catalytic converter, bank 1, faulty