P0172

P0172

Diagnosis Information - DME (DFI)

Lambda control adaptation, bank 1: system too rich

NOTE:
- At idle speed, the diagnosis should indicate a negative deviation (weakening) of more than 3.3 mg/stk of the lambda control adaptation.
- In the lower and upper load ranges, the diagnosis should indicate a negative deviation (weakening) of more than 30% of the lambda control adaptation.

Diagnostic conditions
- Lambda control active
- Lambda control adapted
- Tank vent closed
- Engine temperature > 60 °C (140 °F)
- Intake air temperature < 80 °C (176 °F)
- Engine running > 45 seconds at engine speed < 800 rpm
- then driving at varying load ranges and engine speeds between 1,060 rpm...2,490 rpm

Possible fault causes
- Mechanical fault of tank vent (stuck open)
- Tank vent driver fault
- Changed flow to the mass air flow sensor (e.g. due to wrong air cleaner insert or wrong air cleaner housing)
- Incorrect main filling signal
- Mechanical fault of fuel injector(s) (stuck)
- Wrong fuel high-pressure signal