P0402 95 Mercury -

Question

what is the diagnosis to fix problem?

Answer 1

HI there,

This code is the result of excessive egr flow. It can be caused by a sticking egr valve, or a egr solenoid that is holding the egr open. Allowing vacuum to get to the egr at times when it shouldn't 

P0402 MERCURY - Exhaust Gas Recirculation Flow Excessive Detected

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