2B12

2B12 - P0071

Information saved in
DME

Fault code
2B12 - P0071

Fault text
Outside temperature sensor, plausibility

Fault description
Ambient Air Temperature Sensor Circuit 'A'
Range/Performance

Condition for fault identification
Test condition:
( tumg_roh - tan ) < -12 °Kelvin
(K_TUMG_OBD_MODEL_DELTA_MIN),
( tumg_roh - tan ) > 12 °Kelvin
(K_TUMG_OBD_MODEL_DELTA_MAX)
Terminal condition: Engine running
Voltage condition:
none

Condition for fault memory entry
1000 ms

Action in service
1. DME software release must be more recent than 07-06-
510, fix incorporated since 07-09-521
2. Check sensor for contamination
3. Check plug and wiring harness
4. Check contents of I-cluster error code log
5. Replace ambient air temperature sensor

Fault effect and breakdown warning
MIL on after engine runs 2x

Driver information
Warning light:
MIL

Service instruction
none