Porsche Cayman S (987) F6-3.4L P Code
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P0040
P0040
Diagnosis information - DME V6 DFI
Oxygen sensors ahead of catalytic converter interchanged
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
- Battery positive voltage between 10 V and 16 V
- Time after engine starts > 10 seconds
- Lambda control active
Possible fault causes
- Oxygen sensors upstream interchanged
- Reversed line polarity
Affected contacts on the DFI control unit connector
Connector [B]: - Contact 51
- Contact 61
- Contact 60
- Contact 82
- Contact 81
- Contact 73
- Contact 84
- Contact 59
- Contact 83
- Contact 62
Affected contacts on the oxygen sensor connector ahead of catalytic converter, bank 1
Connector [A]: - Contact 3
- Contact 2
- Contact 1
- Contact 6
- Contact 5
Affected contacts on the oxygen sensor connector ahead of catalytic converter, bank 2
Connector [A]: - Contact 3
- Contact 2
- Contact 1
- Contact 5
- Contact 6