118001 - P0171 (DME)

118001 - P0171

Information saved in
DME

Fault code
118001 - P0171

Fault text
Mixture control: mixture too lean

Fault description
The diagnostic function monitors the lambda closed-loop
mixture control.

Condition for fault identification
Test condition:
The fault is recognized when the mixture for Bank 1 is too
lean and the adaptation limit (25...30 %) is exceeded for 40
sec.
Potential problem source(s):
- Defect in wiring harness
- Defective rail-pressure sensor
- HFM defective
- Leakage in induction tract
- Leak in exhaust system
- Catalytic converter clogged
- Defective injector
- Defect in high-pressure system
Terminal condition: none
Voltage condition:
- Electrical system voltage > 10 V
Temperature condition:
- Ambient temperature > -10 °C
Time condition:
- None
Other conditions:
- Engine on
- Adaptation active

Condition for fault memory entry
The diagnostic fault code is logged when specified
conditions are satisfied, but a reaction period cannot be
provided.

Action in service
- Check induction tract for leaks
- Check exhaust system for leaks
- Check wiring harness between DME and HFM
- Check wiring harness between DME and rail-pressure
sensor
- Replace rail-pressure sensor
- Replace HFM
- Replace fuel injector
- Replace high-pressure pump

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
- Misfiring

Driver information
Warning light:
- ECE emissions warning lamp: on
- US emissions warning lamp: on
- ECE electronic engine power reduction: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
- none