What to know about the Manifold Absolute Pressure Sensor (MAP Sensor):

In order to run, your engine needs a combination of air, fuel and spark. The present engines are much more composite, and require sophisticated measuring of diverse elements to ensure proper fuel combustion. The manifold absolute pressure (MAP) sensor is in charge for some of these tasks.


Your MAP sensor measures the quantity of air entering the manifold, the air temperature, and the number of revolutions in the engine. With this information, the car’s computer can alter fuel and airflow to increase performance while minimizing fuel consumption.


If your engine is not fuel injected, you likely do not have a MAP sensor. However, the vast majority of engines on the road today are fuel injected. For some automakers, the MAP sensor also serves a analytic function, enabling mechanics to analyze the performance of the EGR valve.


Facts to Note:

The MAP sensor is an electronic device, and can fail suddenly.

It is impossible to know if the manifold absolute pressure sensor has failed with a visual inspection – it will need an experienced mechanic to analyze the issue.

A failing MAP sensor will trigger the Check Engine light.

How to Fix:

The vehicle hood is raised and held

The fault manifold absolute pressure sensor is removed

The new manifold absolute pressure sensor is fixed

The computer is tested and codes cleared with a scanner

The vehicle hood is closed and road tested for correct operation

Our Proposal:

While a failed MAP sensor will not disable your car, it’s vehemently recommended that you have it diagnosed and changed as quickly as you can. Driving with a failing or failed MAP sensor can cause your engine to run “rich” or “lean” – that is, with either too much fuel, or too much air. Both of these conditions can damage the engine. However, there are many other conditions that can mimic a failed MAP sensor, including relatively minor vacuum leaks, so it’s vital that one of your expert mechanics check the malfunction code and thoroughly examine the engine.


Common symptoms indicating you may need to change the Manifold Absolute Pressure Sensor (MAP Sensor):


Intermittent or rough idling

Delay in acceleration or deceleration

Check Engine light is on

Excess exhaust emissions resulting in failed emissions test

Importance of this service:


Your engine’s MAP sensor is an essential piece of technology, and should be changed immediately to prevent potentially spoiling your engine with lean or rich operating conditions and to ensure you’re able to pass your emissions test. If you notice any of the signs above, or your Check Engine light is on, have your vehicle analyze by one of your expert mechanics.