Code P0101 or P0102 Mass Air flow Sensor


The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates deceleration or idle.

A large quantity of air entering the engine indicates an acceleration or high load situation. The MAF sensor has an ignition 1 voltage circuit, a ground circuit and a signal circuit. The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The PCM uses the barometric pressure, air density, manifold pressure, throttle position, and the engine RPM in order to calculate a predicted MAF value. The PCM compares the actual MAF sensor signal to the predicted MAF value in order to determine if the signal is stuck based on a lack of variation, or is too low or too high for a given operating condition. DTC P0101 will set if the actual MAF sensor signal is not within a predetermined range of the calculated MAF value.
Possible causes for this code are:

  • Faulty sensor
  • Broken wires at the sensor connector. Tug on each to see if it stretches or breaks
  • Loose air intake duct or breather hose / tube between the MAF sensor and the engine
  • Dirty sensor. Try spraying cleaner inside the sensor, then take for drive to "Blow out" the cleaner

Related Auto Repair and Information

Related Automotive Information


Leave your comments

Post comment as a guest

0

Comments (9)
Subscribe To These Comments-----   

  • Guest - Dee

    Code is p0101 mass airflow sensor

  • Guest - Dee

    I had the mass airflow mount and sensor changed with the original part and The check engine light keeps coming back 3rd time, so what do I do now

  • Guest - alison gartland

    Hi I have 03 Peugeot and the yellow engine check when its on my car will not start and the stop light I always on what's wrong with it I can not depend on it

  • Guest - Andrew

    Hi I got p0101 code in a Nissan sentra I wonder what it is

Load More
LATEST ARTICLES

Ford F-250 Water On Passenger Floor

2014 F-250 drips water on the passenger side floor. The drain on the firewall ...

Ford Auto Repair Questions and Answers

Impala Flashing Engine Light

I have a 2003/2004 impala i was driving it on the high way the other day and ...

Chevrolet Impala Car Repair Questions

Hyundai Tucson 2016 A/C Blows Warm Air

2016 Hyundai Tucson. A/C worked great, parked the car for a couple of hours, ...

Import Car and Truck Repair Questions

Chevrolet Blazer Lost Power To Wheels

2000 blazer 4x4 lost power to drivetrain going down the highway. No noise it ...

Chevy Blazer and GMC Jimmy Questions

Dodge Durango Timing Chain Noise

My 03 Dodge Durango 4.7L engine was blowing white smoke from exhaust. Took the ...

Dodge and Chrysler Repair From Expert Mechanic