FooseGalant
12-21-2015, 05:58 PM
Been chasing a P0400 EGR CEL code on my 2000 V6 Galant ES (Fed Spec). Took it to the dealer after I tested all the components that the manual said to check that were located under the hood. They all passed. The tech at the dealer said the failure was the MDP sensor and they replaced it. It popped the code again within 20 miles. At dealer for second time and they said that they had left a vacuum line off the EGR valve and there was moisture in the EGR. Cleaned and assembled completely, I was off driving again for 20 miles...and the CEL popped again.
Question - How do I test the MDP sensor? I can't find anything in the manual about it. The $160 part did not fix the problem. Did not know it was part of the EGR system. Changed the gas cap also and that had no effect.
Any suggestions?
UPDATE - After another 3 hours at the dealer (1 hour on the phone with the factory experts) they feel they have tracked down the issue. There seems to be a check valve in one of the EGR pipes. The one with a yellow mark on it. They said it is like a wire mesh ball that that will restrict air flow but not shut it under certain conditions. I guess it just ate it or it was damaged in the cleaning process while checking the pies for blockages. They have ordered the pipe cluster (only 3 left in the US). We will see if this fixes the issue and the P0400 code does not come back. Part due 1/5/16.
Has anybody else run across this issue with V6 Galants?
Thanks
Question - How do I test the MDP sensor? I can't find anything in the manual about it. The $160 part did not fix the problem. Did not know it was part of the EGR system. Changed the gas cap also and that had no effect.
Any suggestions?
UPDATE - After another 3 hours at the dealer (1 hour on the phone with the factory experts) they feel they have tracked down the issue. There seems to be a check valve in one of the EGR pipes. The one with a yellow mark on it. They said it is like a wire mesh ball that that will restrict air flow but not shut it under certain conditions. I guess it just ate it or it was damaged in the cleaning process while checking the pies for blockages. They have ordered the pipe cluster (only 3 left in the US). We will see if this fixes the issue and the P0400 code does not come back. Part due 1/5/16.
Has anybody else run across this issue with V6 Galants?
Thanks