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P0404 Diagnostic Trouble Code Discussion for January 2015

EGR Position Sensor Performance

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Trouble Ticket Help Requests for DTC P0404
Help Request Posted
1998 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X7W
P0404: EGR Open Position Signal Performance. The vehicle won't see the desired EGR value when we were doing EGR functional test. It shows the EGR actual value but not the desired value. We put a new EGR valve, we checked the wiring, wiring is ok. We have 5-bolt reference and the grounds are ok. We even r...
January 30, 2015