29F0 - P2179 (DME)

29F0 - P2179

Information saved in
DME

Fault code
29F0 - P2179

Fault text
Fuel mixture adaptation 2, sumcheck fault

Fault description
System Too Lean Off Idle (Bank 2)

Condition for fault identification
Test condition:
Fuel-supply system monitored with aid of mixture
adaptation data; here lower part-load range (multiplicative
adaptation), system too lean
Release conditions:
- No active EVAP air discharge
- No faults that disable diagnosis are present
- Relative charge (Last) > 20 %
- Mass airflow > 40 kg/h
- Temperature conditions met
Terminal condition: Engine running
Voltage condition:
battery voltage < 11 volts or battery voltage > 16 volts

Condition for fault memory entry
Approximately 10 min.

Action in service
Induction vacuum leak/exhaust air leak (AFR O2 sensor !)
Low fuel pressure
Check oxygen sensors before cat.
Check tank EVAP air discharge (air leak !)
Check HFM (contamination, defect)

Fault effect and breakdown warning


Driver information
Warning light:
US MIL on (2nd driving cycle)

Service instruction
none