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Re: PO404 code- is it serious?
Ok Workman1,
I did some searching and found this in of all places, A Ford diesel site but since OBDII codes are Govt. stardardized, well here goes.
P0404 EGR Exhaust gas recirculation control circuit range/performance. Difference between command and actual exceeds a specified limit
Another search concerned a Grand Prix in which poor performance lit the Service Engine Soon light and produced a P0404 DTC. Their problem was solved with a catalytic converter replacement indicated by removing one of the O2 sensors from the exhaust pipe between the motor and catalytic converter which allowed the engine to breathe and perform much better. It also supports the Ford explaination.
I guess the EGR passages could clog enough to cause a difference between actual EGR flow and flow rate commanded by the computer.
Of course it could be a one time deal where resetting it or a number of good starts or run cycles will turn it off anyway.
Does it run good?
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