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• P0138

  P0138

  
  

  Diagnosis information - DME V6 DFI Oxygen sensor behind cat. conv., 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).

  
  

  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

• Exhaust temperature between 350 °C (662 °F) and 800 °C (1,472 °F)
• Battery positive voltage between 11 V and 16 V
• Engine idling for 200 seconds after start
  
  

  Possible fault causes

• Short circuit to B+ in signal line
• Oxygen sensor faulty (short circuit to B+)
  
  

  Affected contacts on the DFI control unit connector

  
  
  Connector [B]:
• Contact 7
• Contact 76
• Contact 77
  
  

  Affected contacts on the oxygen sensor connector behind catalytic converter, bank 1

  
  
  Connector [A]:
• Contact 2
• Contact 3
• Contact 4