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Mass or Volume Air Flow Sensor A/B Correlation

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

How is this code read?

This is a standard OBD-II code; any basic scanner reads it on vehicles built after 2004.

  • PPowertrain
  • 0Generic code
  • 1Fuel / Air
  • 0FSequence number

What does it mean?

The P010F code involves the Mass Air Flow Sensor on your vehicle. This sensor is positioned just after your air filter box to work out how much air is flowing into your engine. It is a small sensor that is used to calculate how much fuel the injectors need to use for an optimum air/fuel ratio. If it is faulty, the car has to guess how much fuel it should insert based on throttle position or another means.

MAF sensors work using a thermistor in an open area, with air flowing through this thermistor. A hot MAF sensor is a version that has voltage on one resistor to regulate the air intake. With a higher air flow comes a lower temperature of the resistor, therefore a lower resistance. The Powertrain Control Module (PCM) receives the altering voltage values to determine the amount of air entering the engine inlet valves, to distribute the air to each combustion chamber accordingly.

A cold MAF sensor has two thermistors. One measures ambient temperature and is within the sensor housing. The other is at the center of the air intake to measure air flow. The PCM relates between those two thermistors thermal voltage values and determines the rate of air flow through the inlet. A VAF or Volume Air Flow sensor operates using a flap which opens based on the amount of air flowing into the intake. Lower rate of air intake means the damper, which is spring loaded, will close.

A potentiometer is used here to transfer the signal to the Powertrain Control Module (PCM). PCM is used to determine the engine control function based on the voltage variation coming from the potentiometer inside the VAF sensor and therefore the amount of air being fed into the intake. Cars may use several VAF or MAF sensors for the PCM to distinguish the difference between readings and as a confirmation that the correct amount of airflow is being read.

The P010F reading may appear as a fault code because of these sensor voltage readings may differ than the allowable tolerance, showing a light or fault on your instrument cluster.

Symptoms

Likely causes

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.