3FF1 - P0101 (DDE)

3FF1 - P0101

Information saved in
DDE

Fault code
3FF1 - P0101

Fault text
DDE: Air-mass flow sensor: Ratio of calculated to measured
air mass too low

Fault description
The diagnostic trouble code is logged in the ECU when the
ratio of the calculated to the measured air mass falls below a
limit value based on the operating point in the program map.

Condition for fault identification
Test condition:
Plausibilization of the HFM runs during overrun operation
or during the drift compensation learning phases. The HFM
plausibility check must also be enabled.
Voltage condition:
Plausibilization of the HFM runs during overrun operation
or during the drift compensation learning phases. The HFM
plausibility check must also be enabled.

Condition for fault memory entry
Debounce (4000 ms)

Action in service
1. Check air-induction tract between turbocharger and
intake-air plenum.
2. Check swirl valves for sticking.
If results of the tests are OK:
Replace mass-airflow sensor.

Fault effect and breakdown warning
The error disables regeneration in the particulate filter.

Driver information
Warning light:
MIL

Service instruction
none