Parts Replaced but codes come back. What do you do?

Asked by Jun 13, 2017 at 02:13 PM about the 2003 Chevrolet Impala Base

Question type: Maintenance & Repair

I have replaced the EGR valve and engine
coils and still get codes. I have had them
cleared and they still come back.

1 Answer


Then you could have wiring resistance problems, sensor grounding issues, or the ECM is freaking out. I recommend getting a live data scan performed and that should track down the problem.

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