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Can a Faulty EGR Valve Affect the Air Flow Meter?

Updated February 21, 2017

A car's engine depends on a balanced ratio of fuel and air for proper combustion and sufficient horsepower. A faulty exhaust gas recirculation (EGR) valve affects the functioning of the mass air flow (MAF) sensor for an engine's air flow.

Identification

The EGR valve allows a small quantity of exhaust gas from the combustion chamber into the engine's intake manifold, resulting in a cooling of combustion fumes. The MAF sensor, also known as the air flow meter, calculates the amount of air entering the engine for balancing with the fuel.

Effects

Typically, a faulty EGR valve leaks more gas into the engine's intake manifold, which has a direct effect on the MAF's functioning. The MAF detects more gas or air within the system and automatically adds more fuel to the mixture to balance the fuel-to-air ratio.

Significance

A faulty EGR valve requires immediate replacement. Aside from wasting excess fuel from an improper fuel-to-air ratio, a faulty EGR valve releases harmful emissions into the atmosphere.

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About the Author

Writing professionally since 2010, Amy Rodriguez cultivates successful cacti, succulents, bulbs, carnivorous plants and orchids at home. With an electronics degree and more than 10 years of experience, she applies her love of gadgets to the gardening world as she continues her education through college classes and gardening activities.