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• P2273

  P2273

  
  

  Diagnosis information - DME V6 DFI

  
  

  Oxygen sensor behind catalytic converter, bank 1 - signal too lean / too rich NOTE:

  This fault is detected if the oxygen sensor signal ahead of the catalytic converter deviates by a certain value from the control value (rich/lean mixture) within a certain time.
  Diagnosis is initiated by fault detection in the mixture control.
  
  

  Diagnostic conditions

• Relatively long drive in various operating states
• Air-mass flow between 30 kg/h and 200 kg/h
  
  

  Possible fault causes

• Leak in exhaust system between the two oxygen sensors on bank 1
• Oxygen sensor ahead of catalytic converter, bank 1 faulty (old)
• Tank vent stuck in open position
• Secondary air before intake
• Fault in intake camshaft
• Mechanical fault in valve drive
• Valve lift error
• Oxygen sensor behind catalytic converter faulty