P0100 OBD-II Trouble Code: Mass Airflow (MAF) Circuit Problem

P0100 code definition

Mass Airflow (MAF) Circuit Problem

The Code P0100 code is often associated with a P0101, P0102, P0103 and P0104 codes.

What the P0100 code means

P0100 is the general code for a problem with the Mass Airflow (MAF) Sensor or Circuitry.

What causes the P0100 code?

The MAF Sensor problems may have several causes:

• The most common source of the problem is usually related to the electrical plug being either disconnected or the wiring is damaged at the plug.

• The next most frequent problem is the sensor on the MAF is defective or damaged.

• On many MAF sensors, the sensor is built into the MAF unit.

What are the symptoms of the P0100 code?

• P0100 code will be generally preceded by the Check Engine Light coming on the dashboard display. Generally, the vehicle runs well enough to give you time to contact a certified technician to help you to diagnose the problem.

• The engine runs close to normal but it may run slightly erratically, have less power and idle inconsistently.

How does a mechanic diagnose the P0100 code?

• P0100 is diagnosed with an OBD- II scanner. A certified technician should then reset the OBD- II fault codes and road test the vehicle to see if the code comes back. He can observe this by watching it live on his scanner while driving. If the code comes back, then the technician will need to do a visual inspection to determine any electrical connector, wiring, or sensor issues.

Common mistakes when diagnosing the P0100 code

• Diagnostic errors are largely due to not following the procedure. First, follow the test procedure in the diagnosis for the connector, wiring and sensor. Do not buy a MAF sensor unless the other tests indicate no problem.

• Before buying a MAF sensor, try cleaning it with a specialized spray cleaner made for MAF sensors as these often get considerable carbon build up from the emission system, especially at idle.

How serious is the P0100 code?

• The P0100 code will not prevent the car from driving. The MAF sensor issue can cause excessive fuel consumption in certain circumstances, so it is best to have the technician inspect it at your first opportunity.

• Often times, if the Check Engine Light came on immediately at start up, the OBD- II system can be reset and the vehicle will operate normally.

What repairs can fix the P0100 code?

The most common potential repairs to address the P0100 code are as follows:

• Have a certified technician verify the code with a scanner. Reset the fault codes and perform a road test.

If the P0100 code comes back, then follow the test procedure.

• Inspect the electrical connector to insure it is attached. Disconnect it and then reinstall to ensure fresh electrical connection.

• Repair any wiring that's frayed or broken on the connector.

Additional comments for consideration regarding the P0100 code

Many vehicles with mileage over 100,000 have momentary sensor problems that usually occur during start up or prolonged stress situations on the drive train.

If the Check Engine Light comes on and the vehicle seems to be operating normally, the OBD-II system can be reset using the scanner and the problem may not reoccur. This is why it is important to verify the fault and reset it before doing any repairs.

Need help with a P0100 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.