P0156

P0156

Diagnosis information - DME (DFI)

Oxygen sensor behind cat. conv., bank 2

NOTE: The switching times (rich/lean) of the oxygen sensor (dynamic response) are tested during and after the overrun phases.

Diagnostic conditions
- Engine at operating temperature
- Steady driving
- Several overrun phases (min. 5)

Possible fault causes
- Misfires on this or the opposite bank
- Oxygen sensor faulty