118002 - P0172 (DME)

118002 - P0172

Information saved in
DME

Fault code
118002 - P0172

Fault text
Mixture control: mixture too rich

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
rich and the system falls below the adaptation limit (25...30
%) for 40 sec.
Potential problem source(s):
- Crankcase ventilation defective
- Defective intake-manifold pressure sensor before and
behind throttle valve
- Defect in evaporative emissions valve
- Catalytic converter clogged
- Fuel injector defective
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 positive crankcase ventilation system
- Replace intake-manifold pressure sensor before and behind
throttle valve
- Replace EVAP evaporative emissions valve
- Replace fuel injector

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