118E02

118E02 - P2188

Information saved in
DME

Fault code
118E02 - P2188

Fault text
Mixture adaptation, idle: mixture too rich

Fault description
The diagnostic function monitors the air-fuel mixture at idle.

Condition for fault identification
Test condition:
Data adoption/matching with Summary Table; as indicated
PP -> ST
Mass-airflow rate > 20 kg/h
Engine speed > 1600 rpm
Potential problem source(s):
- Diagnostic fault code logged owing to defective:
- Oxygen sensor (pre-catalyst)
- HFM
- Injection nozzle
- Intake-manifold pressure sensor
- Leaks in and around induction system (positive crankcase
ventilation, oil cap, oil dipstick, tank EVAP vent line, brake
booster)
- Leak in exhaust system (exhaust-side cylinder head to
post-catalyst oxygen sensor) Fuel presupply pump
- Rail-pressure sensor
- Camshaft position sensor
- Intake-air temperature
- Poor-quality gasoline
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- Engine ON

Condition for fault memory entry
The diagnostic fault code is logged when the fault remains
present for longer than 1 min.

Action in service
- Because this is a secondary fault, start by repairing the
primary faults

Fault effect and breakdown warning
Breakdown notice:
It is possible to continue driving the vehicle, but passing
maneuvers should not be attempted owing to the possible
low engine output.
Possible apparent symptoms:
Engine runs poorly with power loss

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

Service instruction
Always delete the mixture adaptation after repairing the
problem source!