P0138
P0138
Diagnosis information - DME V8 DFI
Oxygen sensor behind catalytic converter, bank 1, above limit value
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
- Engine at operating temperature
- then drive for 2 min.
- then > 30 sec. Engine idling
2010 Porsche Cayenne Turbo (9PA) V8-4.8L Turbo Page 21
Possible fault causes
- Short circuit to B+ in signal line
- Oxygen sensor faulty (short circuit to B+)
Affected contacts on the DME control unit connector
Connector [A]:
- Contact 45
- Contact 49
- Contact 50
Affected contacts on the oxygen sensor connector behind catalytic converter, bank 1:
- Contact 2
- Contact 3
- Contact 4