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• P0031

  P0031

  
  

  Diagnosis information - DME V6 DFI

  
  

  Driver for oxygen sensor heater ahead of catalytic converter, bank 1

  
  

  NOTE: Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).

  
  

  NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.

  
  

  Diagnostic conditions

• Battery positive voltage between 9 V and 16 V
• Time after engine starts > 10 seconds
  
  

  Possible fault causes

• Short circuit to B+
• Short circuit to ground
• Open circuit in line
• Fuse FE 17 faulty (fuse carrier in plenum panel E-box)
• Loose contact in connector
• Oxygen sensor heater faulty
• Oxygen sensor faulty
  
  

  Affected contacts on the DFI control unit connector

  
  
  Connector [B]:
• Contact 51
  
  

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

• Contact 3