I'd be more inclined to suspect the computer.

I agree with Marty, time to visit the dealer before proceeding further. Talk to the service manager and get yourself assigned to an advisor who has the best diesel mech in HIS group on techs.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)