Symptoms of a Bad or Failing Manifold Absolute Pressure Sensor (MAP Sensor)

Our certified mechanics come to you · 12-month, 12,000-mile warranty

GET A QUOTE Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of Replacing a Bad or Failing Manifold Absolute Pressure Sensor (MAP Sensor)

Common signs of manifold absolute pressure sensor problems include excessive fuel consumption, lack of power, and failing an emissions test. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Manifold Absolute Pressure Sensor (MAP Sensor) Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2010 Volkswagen Passat $262 $192.38 $70.00 12% $299.88
2014 Chevrolet Camaro $122 $51.53 $70.00 23% $159.03
2007 Ford Ranger $141 $70.61 $70.00 21% $178.11
2007 Land Rover LR3 $101 $31.18 $70.00 27% $138.68
2008 BMW X6 $249 $179.38 $70.00 13% $286.88
2006 Mercedes-Benz C55 AMG $171 $101.38 $70.00 17% $208.88
GET A QUOTE FOR YOUR CAR Get a fair and transparent estimate upfront

How to Diagnose a Bad or Failing Manifold Absolute Pressure Sensor (MAP Sensor)?

manifold pressure sensor

The Manifold Absolute Pressure (MAP) sensor is used by the Powertrain Control Module (PCM) for engine load input. The PCM uses this input, as well as others, to calculate the correct amount of fuel to inject into the cylinders.

The MAP sensor measures the absolute pressure inside the intake manifold of the engine. At sea level, atmospheric pressure is about 14.7 psi (pounds per square inch). When the engine is off, the absolute pressure inside the intake equals atmospheric pressure, so the MAP will indicate about 14.7 psi. At a perfect vacuum, the MAP sensor will read 0 psi. When the engine is running, the downward motion of the pistons create a vacuum inside the intake manifold (For the purposes of engine control, when a technician says vacuum, what they are really saying is pressure that is less than atmospheric pressure). With a running engine, intake manifold vacuum usually runs around 18 - 20 “Hg (inches of mercury). At 20 “Hg, the MAP sensor will indicate about 5 psi. This is because the MAP sensor measures “absolute” pressure, based on a perfect vacuum, rather than atmospheric pressure.

A failed MAP sensor has serious implications on fuel control, vehicle tailpipe emissions and fuel economy. Symptoms of a bad or failing MAP sensor include:

1. Excessive fuel consumption

A MAP sensor that measures high intake manifold pressure indicates high engine load to the PCM. This results in an increase of fuel being injected into the engine. This, in turn, decreases your overall fuel economy. It also increases the amount of hydrocarbon and carbon monoxide emissions from your vehicle to the surrounding atmosphere. Hydrocarbons and carbon monoxide are some of the chemical components of smog.

2. Lack of power

A MAP sensor that measures low intake manifold pressure indicates low engine load to the PCM. The PCM responds by reducing the amount of fuel being injected into the engine. While you may notice an increase in fuel economy, you will also notice that your engine isn’t as powerful as it was before. By reducing the fuel into the engine, combustion chamber temperatures are increased. This increases the amount of NOx (oxides of nitrogen) production within the engine. NOx is also a chemical component of smog.

3. Failed emissions test

A bad MAP sensor will cause your vehicle to fail an emissions test. Your tailpipe emissions may show a high level of hydrocarbons, high NOx production, low CO2, or a high level of carbon monoxide.

A properly trained technician like those at YourMechanic are capable of diagnosing and repairing a failed MAP sensor.

MAP (Manifold Absolute Pressure) sensor
fuel system
low engine pressure

Fast and easy Manifold Absolute Pressure Sensor (MAP Sensor) Replacement service at your home or office.

GET A QUOTE FOR YOUR CAR
Get a fair and transparent estimate upfront

Recent Manifold Absolute Pressure Sensor (MAP Sensor) Replacement reviews

Excellent Rating


YourMechanic Manifold Absolute Pressure Sensor (MAP Sensor) Replacement Service

Average Rating

4.8/5

Number of Reviews

52

Rating Summary
48
3
0
0
1
48
3
0
0
1

Anthony

30 years of experience
61 reviews
Anthony
30 years of experience
Anthony was running behind, however he call me well in advance which was great. He arrived and completed the work in a timely fashion and I would highly recommend Anthony! Will be utilizing his services again!
2011 VOLKSWAGEN JETTA - MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP SENSOR) - ATLANTA, GEORGIA

Bryan

19 years of experience
24 reviews
Bryan
19 years of experience
This man is great at what he does. I've utilized his services twice and my vehicle thanks me for it!! Thank you so much Bryan! People who are good at what they do make the world go 'round!
2011 HYUNDAI SONATA - MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP SENSOR) - WINTER HAVEN, FLORIDA

Christopher

24 years of experience
213 reviews
Christopher
24 years of experience
Chris is extremely knowledgeable, professional and patient. He was extremely friendly and did everything as expected and even showed up much earlier then my scheduled appointment! He is a blessing !
2003 JEEP LIBERTY - MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP SENSOR) - LARGO, FLORIDA

James

20 years of experience
16 reviews
James
20 years of experience
1st time customer. Was a little skeptical. Very good experiece. I will do it again,and request James.
2010 HYUNDAI SANTA FE - MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP SENSOR) REPLACEMENT - HOUSTON, TEXAS

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...

Related questions

Q: Car runs lean, check engine light on

Hello. Thanks for writing in about your 2009 Audi A5 Quattro. If you are having a lean condition, then the fuel pressure needs to be checked. The most common cause of a lean code on this car is either low...

Q: What should I know about the fuel gauge?

Your car’s fuel gauge is pretty self-explanatory. It uses a needle to show you how much gas is left in the tank. Full is marked by an “F” on the right, and empty is marked by an “E” on the...

Q: I am losing compreshion on all my cylinders 2005 Dodge RAM 1500

Hi there - you don't indicate your mileage, but low compression may be a normal result of a high mileage engine, or a problem due to abnormal wear. Oil breakdown can cause excessive piston ring wear. Extremely lean mixtures can...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com