Mechanics

EGR FLOW FAULT CODE

1997 Geo Metro • 4 cylinder FWD Automatic • 117,000 miles

1997 Geo Metro 1.3 mileage: 117,000. I keep getting an EGR flow fault (P0400). I have replace the EGR valve, solenoid, modulator, and taken off the intake to clean out the EGR port. However I am still getting the same fault. I have plugged off the EGR valve vacuum and still flow fault. I don't know what else to try. I have run a vacuum check on all components, and all show to be working and holding vacuum. I don't know what else to try. I also had it in the Chevrolet dealership. All they did was clear the fault! And, said they couldn’t find anything wrong.

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2CarPros-Archives
January 13, 2011.



The EGR system in your car is probably functioning okay. The fault code that you are receiving, more likely than not, is the result of a faulty sensor that monitors the movement of the EGR valve.

Tiny
2CarPros-Archives
Jan 13, 2011.