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Diesel vehicles are equipped with systems that minimize air pollution and the emissions coming from the tailpipe. For diesel engines, especially equipped with a turbo, a system called exhaust gas recirculation is used to bring exhaust with unburned fuel back through the combustion chamber to burn even more thoroughly. This system’s flow is controlled by an exhaust pressure control valve, which senses changes in the exhaust pressure and controls the vacuum through the EGR valve.
It is mounted directly onto the body of the turbo. It limits the amount of ‘dirty’ air that is circulated back through the engine under certain throttle positions and conditions. If the exhaust pressure control valve is not working properly, the engine light can come on. The engine will run rough as an improper amount of air is metered into the engine, and you can see evidence of large amounts of unburned fuel coming out the tailpipe in the form of black smoke or soot.
The exhaust pressure control valve should last the lifetime of your vehicle. If your engine light comes on and you experience a loss of engine power, you may need one of our expert technicians to replace the exhaust pressure control valve.
An unrepaired exhaust pressure control valve can cause further, more expensive repairs to the turbo or exhaust gas recirculation system. As it dramatically affects your engine’s performance, the exhaust pressure control valve should be replaced as soon as symptoms are present and the condition has been properly diagnosed.
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