How to check egr valve is stuck and how to tell diaphragm is bad. Check egr valve if you're getting P040O P0401 P0402 P0403 P0404 P0405 P0406 P0407 P0408 P0409. Also check EGR valve operation if you're experiencing these symptoms rough idle, engine pinging, increased emission, hear knocking noise from engine etc...
Plunger/valve=Pintle
Suction like noise=Good diaphragm
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