Logan Posted October 16, 2018 Report Share Posted October 16, 2018 Any suggestions on how to solve the P0401 code on a 97-03 Pontiac Grand Prix. I have already replaced: EGR valve and it’s gasket PCV valve and it’s O rings MAP sensor Intake manifold and it’s gaskets both upstream and downstream O2 sensors I have also cleaned out the throttle body and the pipes leading in and out of the EGR valve. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 16, 2018 Report Share Posted October 16, 2018 What year and engine? I'll post up a diagram for you to test the wiring tonight. Quote Link to comment Share on other sites More sharing options...
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