2B51

2B51 - P0100

Information saved in
DME

Fault code
2B51 - P0100

Fault text
Air mass sensor, signal

Fault description
Mass airflow signal

Condition for fault identification
Test condition:
Engine running
Terminal condition: Terminal 15
Voltage condition:
Onboard electrical system voltage ubsq > 7.5 V

Condition for fault memory entry
0.2 sec.

Action in service
1. Check wiring harness between DME and mass airflow
sensor A_HFM
2. Replace mass airflow sensor
3. Replace DME

Fault effect and breakdown warning
None
Engine runs roughly

Driver information
Warning light:
MIL ON (US only)

Service instruction
None