[Zeke]

As a new Carrera owner and a new student of the DME engine management system, I can tell you this might well be a very simple matter of a sensor not worrking properly. Or, a corroded ground wire. Now, finding which one is not so simple. But, the head temperature sensor and other varible output sensors have simple tests for the range they shoud be in to function correctly. Others are on-off. If you do a PPI, make sure the person doing it is a crack tune up person. Might save you a ton of headaches in the long run.