Engine Controls System: 105201

105201 - P12B9

Information saved in
DME

Fault code
105201 - P12B9

Fault text
Ambient pressure sensor, overrun: Pressure too high

Fault description
During the control module's shutdown phase the diagnostic
function monitors the barometric-pressure sensor, intake-
manifold pressure sensor and boost-pressure sensor to
determine whether they are all measuring the same pressure.

Condition for fault identification
Test condition:
The fault is recognized when the barometric-pressure sensor
deviates from the average for the pressure sensors
(barometric pressure, boost pressure, intake-manifold
pressure) by more than 70 mbar.
Potential problem source(s):
- Error in sensor measurement
- Sensor defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- 5 sec. after engine off
Other conditions:
- Shutdown phase

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- If the diagnostic fault code has been logged more than 3
times replace the DME.

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
None

Driver information
Warning light:
MY10 ECE:
- ECE emissions warning lamp: off
- ECE electronic engine power reduction: off
- CC message: none
MY10 US:
- US emissions warning lamp: on
- US electronic engine power reduction: off
- CC message: on
MY11 ECE:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: off
- CC message: on

Service instruction
None