Fuel and air

P010F — Mass or Volume Air Flow Sensor A/B Correlation Fault

Severity: medium Drive with care, to a shop

What P010F means

The engine control unit compares the signals from two mass or volume air flow sensors (A and B) and checks them against its own model of engine load. When the readings differ by more than allowed, it sets P010F. Without a trustworthy air measurement, fuel delivery cannot be calculated accurately and the mixture may be off.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish throttle response
  • Hesitation or stumbling on acceleration
  • Higher fuel consumption
  • Rough idle or stalling
  • Lean or rich mixture and abnormal fuel trims

Possible causes

  1. Dirty or failing air flow sensor (one of the two)
  2. Open, shorted or corroded wiring and connectors in a sensor circuit
  3. Intake air leaks downstream of the sensor (cracked ducts, loose clamps, vacuum hoses)
  4. Dirty or damaged air filter and intake duct
  5. Faulty engine control unit (uncommon)

How to diagnose

  1. Scan for codes and freeze frame data, and note any other mixture or airflow codes
  2. Compare live readings of both sensors at idle and under load against expected values
  3. Review short and long term fuel trims; a high positive value points to a leak or under-reading sensor
  4. Inspect intake ducting, boots and clamps for cracks and leaks after the sensors
  5. Check connectors and wiring for corrosion, chafing or breaks, and test sensor power and ground
  6. Inspect the sensing element for dirt or oil film and check the air filter
  7. If needed, swap in a known good sensor and compare readings
  8. If everything else checks out, test the control unit and look for software updates

Common fixes

  • Clean the sensor with a proper cleaner or replace it
  • Repair wiring and connectors
  • Fix intake leaks by replacing ducts, hoses or clamps
  • Replace the air filter
  • Reprogram or replace the control unit if all else is sound

Questions and answers

What does code P010F mean?

It means the two air flow sensors, A and B, are reporting values that do not agree with each other or with the computer's expected model. The cause is usually a sensor, wiring or an intake leak.

Can I drive with P010F?

Only briefly and carefully to get to a shop. The engine may hesitate or stall, and a wrong mixture can harm the catalytic converter and waste fuel.

Will cleaning the MAF sensor fix P010F?

If the sensor is just dirty, cleaning may help. Check for intake leaks and wiring faults first, otherwise the code will likely return.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.