PO400 code

Asked by Jun 29, 2017 at 04:09 PM about the 1997 Chevrolet Camaro Z28

Question type: Maintenance & Repair

I keep getting a PO400 code on my scanner. I changed the EGR valve , EGR
solenoid , also the MAP sensor. Any other ideas what it could be?  The car
has only 31,000 miles on it. It's driving me crazy. What about the inboard O2
sensor.

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