Mass Airflow Sensor ( T126 )
Check the connectors and electrical wiring. Note Always perform a reset of adaption values of the mass air flow sensor if the mass air flow sensor is replaced, or if a leak in the engine intake system have been fixed For EUV engines: If the operating time with the error code active is more than 10 hours, the EGR cooler should be drained because it is likely that the condensation has formed in the air-cooled EGR cooler when the EGR system has been turned off. Perform emptying according to the instructions in the Service Manual, section 01-65. To verify that the fault is fixed, carry out a free acceleration and check that the MAF signal moves
What you'll see
No driver-visible symptom recorded.
System reaction
The ECU turns off the EGR system. Engine power is reduced Depending on the legal requirements for the engine it may not be possible to erase the fault code if it is active.
Diagnostic depth
The voltage in the circuit has been lower than allowed
Short circuit to ground or open circuit