Thanks Arther, Suginami. I will go to pin 8 and see why code 19 is coming up. I will also check the fuel pressure regulator and try to clean the EGR Tube and see what happens.

So far, my experiecne with Mercedes Benz dealerships has not been good. For my Check Engine Light problem, Dealer 1 thought Bad EGR Valve, Dealer 2 thought bad Mass flow sensor, then changed it to ECM. Dealer 3 thought wiring harness was bad.

This forum is extremely usefull and I have learned a lot. I have spent several hours doing research!!! Alldatadiy is another useful site where one can get detailed information about the systems. I still do not have the CD. Looking for paper copies of the repair manuals.

Thanks again and let me know if you have any other idea's.