What are the Symptoms of a Failing MAP Sensor?

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Symptoms of a Failing Manifold Absolute Pressure Sensor:

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


Excessive fuel consumption:

A MAP sensor that measures high manifold pressure indicates high engine load to the PCM. This leads to a rise in fuel being injected into the engine. This, in turn, decreases your overall fuel economy. It also increases the number of hydrocarbon and CO emissions from your vehicle to the encircling atmosphere. Hydrocarbons and carbon monoxide gas are a number of the chemical components of smog.


Lack of power:

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


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 CO.

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