check engine code P0402
Scanned for DTC codes found DTC P0402-excessive EGR flow detected.
I removed and cleaned the carbon from pintile and reinstalled the EGR valve. Cleared the codes and took off. Within 30 miles the light was back on. Now what should I try?
It can be several things.
1. Malfunctioned EGR Valve.
2. A leak i the emissions tubing.
3. Dirty intake manifold.
I would start with taking apart the upper half of the intake manifold and using lots and lots of Carb. Cleaner. I also scrubbed it with a wire brush but most of the build comes off with the spray. If that doesn't work I would move on to the evap system that's on your right side of the engine bay.
Do you hear any whistling noises or loud clicking coming from a sensor?
Check these things out and come back.
Last edited by mini_FD; 07-16-2011 at 10:24 AM.