شیر EGR معیوب

The exhaust gas recirculation valve at fault as a unit — its motor, its position sensor, or the valve as an assembly. It is the general case, and it should be reached after the specific ones: carbon binding the pintle, a blocked passage, a blocked cooler and a damaged seat all produce the same flow and performance codes far more often, and each is cheaper.

Establish that the valve itself has failed before replacing it. A valve that moves smoothly through its full travel by hand, and whose position feedback tracks the command, is not the fault — the restriction is downstream in the passages or the cooler, which is the single commonest reason a replaced valve changes nothing.

It is distinct from the recirculation throttle valve, which is an intake throttle used to create the pressure difference that drives the flow. The two carry similar names, sit in different places and fail differently, and confusing them sends the work to the wrong part of the engine. Where the valve is genuinely at fault the electrical symptoms are usually clear: a winding out of specification, a position sensor that drops out mid-sweep, or a motor that draws heavily against a free pintle.