My engine light is constantly on. i had it checked and the read out code said egr valve. I have tried to take the old one off and clean it, since the guy at the dealership said I might try that before replacing it, but to no avail. I can not get it disconnected from the main pipe. ANy suggestions on this. On other cars, I had to remove the pipe from other under the car in order to remove the egr valve, but was unsure if I needed to do the same here.