How to Replace a Manifold Absolute Pressure (MAP) Sensor

A manifold absolute pressure sensor, or MAP sensor for short, is used in fuel injected vehicles to measure the air pressure inside the intake manifold of the engine. The MAP sensor sends this information to the electronic control unit, or ECU, which uses this information to adjust the amount of fuel being added at any point to achieve the most optimal combustion. Symptoms of a bad or failing MAP sensor include excessive fuel use and lack of power in your vehicle. You may also become aware of a bad MAP sensor if you car fails an emissions test.

Part 1 of 1: Disconnect and replace bad MAP sensor

Materials Needed

a common type of map sensor installed

Step 1: Locate the installed MAP sensor. Being familiar with the part you are looking for should help you locate the bad sensor on your vehicle.

If you do not know where it is or what it looks like, study the replacement part to help you identify it in the engine bay.

To help narrow down your search, keep in mind that there will be a rubber vacuum hose running to the MAP sensor, as well as an electrical connector with a group of wires coming from the connector.

removing clamp on vacuum line

Step 2: Use pliers to remove the retaining clamps. Any clamps retaining the vacuum line should be disconnected and moved down the length of hose to free the vacuum line from the nipple it is connected to on the MAP sensor.

unbolted map sensor

Step 3: Remove any bolts holding the MAP sensor to the vehicle. Use the socket wrench to remove any bolts securing the sensor to the vehicle.

Set them aside in a safe place.

unplugged map sensor

Step 4: Remove the electrical connector plugged into the sensor. Unplug the electrical connector by squeezing the tab down while firmly pulling the connectors apart.

At this point, the sensor should be free to be removed. Remove it and connect the new sensor to the electrical connector.

Step 5: If the MAP sensor was bolted to the vehicle, replace these bolts. Make sure to tighten the bolts, but do not overtighten them. Small bolts will break easily if over-tightened, especially on older vehicles. An easy method to get consistent results is to use a wrench with a short handle.

reinstalled map sensor

Step 6: Replace the vacuum line and any clamps that were removed. Once the vacuum hose is reconnected, the replacement is complete.

If this is not a job you feel comfortable with, have an experienced YourMechanic mobile technician replace the manifold absolute pressure sensor for you at your home or office.


Next Step

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Recent Manifold Absolute Pressure Sensor (MAP Sensor) Replacement reviews

Excellent Rating

(101)

Rating Summary
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Robert

23 years of experience
218 reviews
Robert
23 years of experience
Volkswagen Passat - Manifold Absolute Pressure Sensor (MAP Sensor) Replacement - Houston, Texas
This guy was awesome! He came an hour early and was done changing my 2012 VW Passat MAP sensor in 30 minutes. He also did a 50 point inspection and now my car is back running great! I highly recommend Robert
Volkswagen Passat - Manifold Absolute Pressure Sensor (MAP Sensor) - Houston, Texas
Robert is a great mechanic! He knows what he is doing.. his timing is amazing.. he just replaced my vw map sensor and i definitely recommend him for any service! I do my best to book Robert for future services!

Ben

41 years of experience
1245 reviews
Ben
41 years of experience
Ford Explorer - Manifold Absolute Pressure Sensor (MAP Sensor) - Houston, Texas
Was on time, no let me correct that, he was always early. Did what he was there for and was done. Highly recommend Ben!!!!
Volkswagen Passat - Manifold Absolute Pressure Sensor (MAP Sensor) - Bellaire, Texas
Ben was great! He was prompt to the appointment and very friendly and knowledgeable. I will definitely be requesting him in the future should I need automotive work done.

Jay

37 years of experience
846 reviews
Jay
37 years of experience
Volkswagen Passat - Manifold Absolute Pressure Sensor (MAP Sensor) - San Jacinto, California
Jay provided Great service, he was very Knowledgeable with issues regarding my car. Explained what he did, and recommendations of future services needed. Will definitely use jay again, and looking forward to booking him to service our other car. Thank you Jay

Chris

11 years of experience
27 reviews
Chris
11 years of experience
Jeep Liberty - Manifold Absolute Pressure Sensor (MAP Sensor) - Layton, Utah
Was on time, extremely knowledgeable & did a great job with full understanding explanation. Very pleased & I will request him again in the future.

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