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egr flow sensor A curcuit high input---p0406. replace exhaust gas recirculation valve.--EGR-- or clean out carbon from engine side. if this does not work by cleaning, replace egr valve. also check all wire connections.
Exhaust gas recirculation sensor A (circuit high)
Obviously the sensor or connection is faulty. I'd try cleaning connection with contact cleaner, add some di-electric grease/lube to the connection, check all vacuum lines if applicable & have code erased, and try it.