99 expy code po401
Senior User
Joined: Oct 2004
Posts: 418
Likes: 0
From: Richmond, TX
P0401 EGR Flow Insufficient Detected
Probably need to remove the t-body and clean out the two passages that go to the EGR tube. Your gonna have to get gaskets to replace the onve between the t-body and the upper intake, the t-body and the egr, and while your at it (if you have never cleaned or replaced the IAC) the gasket that goes there also. Take it all apart, clean it and you should be good to go.
Probably need to remove the t-body and clean out the two passages that go to the EGR tube. Your gonna have to get gaskets to replace the onve between the t-body and the upper intake, the t-body and the egr, and while your at it (if you have never cleaned or replaced the IAC) the gasket that goes there also. Take it all apart, clean it and you should be good to go.
