How to replace the mass air flow sensor

The Mass Air Flow (MAF) sensor helps the engine computer maintain optimal combustion. Failure symptoms include rough idling and a rich car ride.

The mass air flow sensor, or MAF for short, is found almost exclusively on fuel-injected engines. The MAF is an electronic device that is installed between your car's airbox and the intake manifold. It measures the amount of air passing through it and sends this information to the engine computer or ECU. The ECU takes this information and combines it with intake air temperature data to help determine the proper amount of fuel needed for optimal combustion. If your vehicle's MAF sensor is faulty, you will notice a rough idle and a rich mixture.

Part 1 of 1: Replacing a Failed MAF Sensor

Necessary materials

Gloves
Mass Air Flow Sensor Replacement
Screwdriver
wrench

Step 1: Disconnect the electrical connector from the mass air flow sensor.. Squeeze the tab of the electrical connector on the harness side by pulling hard on the connector.

Keep in mind that the older the car, the more stubborn these connectors can be.

Remember, do not pull on the wires, only on the connector itself. It helps to use rubberized gloves if your hands slip off the connector.

Step 2. Disconnect the mass air flow sensor.. Use a screwdriver to loosen the clamp or screws on each side of the MAF that secure it to the intake pipe and air filter. After removing the clips, you will be able to pull out the MAF.

FunctionsA: There are many different ways to mount the MAF sensor. Some have screws that attach it to an adapter plate that attaches directly to the airbox. Some have clips that hold the sensor to the intake pipe line. When you get a replacement MAF sensor, pay attention to the type of connections it uses and make sure you have the proper tools to disconnect and reconnect the sensor to the airbox and intake pipe.

Step 3: Plug in the new mass air flow sensor. The sensor is inserted into the inlet pipe and then fixed.

On the airbox side, it may be bolted together, or it may be the same as the intake side, depending on your particular vehicle.

Make sure all clamps and screws are tight, but do not overtighten as the sensor is plastic and may break if handled carelessly.

A warning: Take extra care not to touch the sensor element inside the MAF. The element will be opened when the sensor is removed and it is very delicate.

Step 4 Connect the Electrical Connector. Connect the electrical connector to the new mass air flow sensor by sliding the female part of the connector over the male part attached to the sensor. Press firmly until you hear a click, indicating that the connector is fully inserted and locked.

At this point, double check all your work to make sure you haven't left anything loose and the job is complete.

If this work seems too much for you, a qualified AvtoTachki specialist can come to your home or office to replace the mass air flow sensor.