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Air intakeSeverity Medium: diagnose soon

P0102Mass or Volume Air Flow "A" Circuit Low

What it means

The MAF signal is lower than the sensor can produce with the engine running: the ECU sees almost no airflow. Usually the signal or supply circuit is open, or the sensor has failed.

Symptoms

  • Hesitation or flat spots when accelerating
  • Rough idle or stalling
  • Higher fuel consumption
  • On diesels: limp mode, sometimes black smoke

Common causes

  • Open signal wire or missing supply
  • Signal shorted to ground
  • Failed MAF sensor
  • Unplugged or corroded connector

What to check first

  1. Check the supply and ground at the connector
  2. Check the signal at idle (often around 1 V for voltage-output sensors)
  3. Check the wiring for chafing
Can I drive with P0102? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind P0102

Mass air flow sensor (MAF)Wiring, typical values, multimeter and scope tests

Known engine problems that set P0102

1.9 TDI PD: Air mass meter (MAF) reading lowVolkswagen, Audi, Skoda, Seat, Ford · typically 100,000–250,000 km

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P0102: questions and answers

What does P0102 mean?

P0102: Mass or Volume Air Flow "A" Circuit Low. The MAF signal is lower than the sensor can produce with the engine running: the ECU sees almost no airflow. Usually the signal or supply circuit is open, or the sensor has failed.

What are the symptoms of P0102?

Hesitation or flat spots when accelerating. Rough idle or stalling. Higher fuel consumption. On diesels: limp mode, sometimes black smoke.

What causes P0102?

Open signal wire or missing supply. Signal shorted to ground. Failed MAF sensor. Unplugged or corroded connector.

How do you diagnose P0102?

1. Check the supply and ground at the connector 2. Check the signal at idle (often around 1 V for voltage-output sensors) 3. Check the wiring for chafing

Can I drive with P0102?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.