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
  • Guest - Andrew

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

  • Guest - Matt

    In reply to: Guest - Andrew

    Like this article states- sounds like you have a mass air sensor problem. You can try cleaning it, but that usually does not work. If the wiring is OK, You would have to have it replaced.

  • Guest - JIM

    I'm getting p0101 and p0131 constantly on my 2000 grand am. I seem to be lacking power sometimes, and I've had it twice now where I have no power in overdrive. I litterly have to floor it and get into passing gear to get my car to accelerate. I already changed the EGR cause I had that one coming up too. But the problem is still there

  • Guest - Frank

    In reply to: Guest - JIM

    Sound like a plugged catalytic converter. That would also be the cause of your EGR valve code.

  • Guest - gopinathan

    Sir, I own a Matiz 1999 model.My mechanic carried out engine reboring after observing heavy smoke through exhaust pipe. After reboring, the engine starts normally, but when we accelerate the engine, the fuel flow is getting chocked and the engine is not picking up .

  • Guest - Tech

    In reply to: Guest - gopinathan

    Hard to say. But sounds like your mechanic did not do something correctly. Timing could be off, bore too large, rings not seating, etc.


Latest Articles

2005 Chevy Trailblazer Check ...

Hello, My check engine light and now my ABS light in my truck won't go off. They've been on for ...

06 f150 5.4 missing on 5 ...

I purchased a truck that had caught on fire. Just give me your best guess. The truck had an ...

1997 dodge ram 1500 4wheel ...

My front passenger wheel feels like its going to wobble off . I checked the lug nuts and they are ...

Chrysler Sebring Throttle ...

Chrysler Sebring convertible the electronic throttle control warning light is flashing. Car has ...

Land Rover codes and what to ...

I have codes on a 2003 land rover Freelander, the code are P0420, p1472, P1477, and P0174, how do i ...

Log In Or Register
? The Benefits

How Things Work

Air Conditioning System Operation

The A/C system provides the following features:

Cooled or dehumidified air for the comfort of the occupants
Power ventilation
Windshield defrosting
Side window defrosting

During most operating conditions, outside air enters the vehicle in the following manners:

Read more...

Common Engine Codes

Code P0171 Fuel Trim Error

The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals, without oxygen sensor (O2S) input.

Read more...
Be Social With Us !

Be Social With Us !

Facebook