A common source of EGR failure doesn't actually involve the valve itself. If the EGR temperature goes bad, or takes faulty reading as the result of carbon build-up, your EGR valve will fail to perform the way it should. In most cases, the EGR system flow will remain insufficient, no matter how hot your engine becomes.

Why does my EGR valve keep going bad?

The EGR system flow is insufficient.

A clogged or restricted EGR passageway. The EGR valve stuck closed. Carbon build up on EGR temperature sensor. Vacuum supply issues at the (Vacuum operated EGR valve)

How often do EGR valves go bad?

An average car's EGR valve has a lifespan of approximately 10 years in service. Proper maintenance of the valve is a must if you want to avoid any performance related issues on your car. If you notice a smell of fuel that comes out from under the hood or rough idling, then it might be time to replace the valve.

Why would an EGR valve need to be replaced?

On older cars operated by engine vacuum, the EGR valve diaphragm can deteriorate and leak, causing a rough idle and a check engine light. In that case, the valve should be replaced. Also, over time the valve can accumulate carbon buildup and stick open, causing a rough running engine.

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