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• P12A1

  P12A1

  
  

  Diagnostic information - DME V6 DFI Fuel high pressure implausible

  NOTE: The diagnostics detect a deviation in the fuel high pressure.

  
  

  Diagnostic conditions

• Battery positive voltage 10 V ... 16 V
• Engine start detected > 5 sec.
• No fault codes P0193 or P0192
  
  

  Possible fault causes

  
  
• Tank vent (TEV) mechanically faulty (does not close fully)
• Fuel high-pressure sensor faulty
• Fluctuating fuel high pressure, e.g. due to:
  • Low-pressure fuel circuit

    • Pressure relief valve

    • Fuel high-pressure pump

    • Injection valve