PeachParts Mercedes-Benz Forum - View Single Post - Will a "bad" ETA damage modules? ('94 E420)

JimF · #4 03-07-2007, 11:41 AM

Larry, with 160K on the '94 E420, the first that comes to me, is was the wiring harness replaced?? If not, I'd certainly start there. As you have read here, many cars where brought back from their apparent 'death' when it was replaced.

I've NEVER seen one of the modules go bad . . . and in time (12 years), my tech has maybe replaced one???? The DTCs that are generated point to a faulty EA but, in my experience, it's always something else.

A good scanner will help to read the codes; reset them and retake them to form a 'history'. When my ETA was going bad it pointed to the EA module as well as other items.

A bad wiring harness can, and HAS, taken it's toll on ECUs, so that's a reality.

I'd either have the ETA rebuilt or replaced provided the codes support that conclusion. MENU#24 shows the typical codes that you encounter when the ETA is bad or going bad. I recommend you start there and keep track of the generated codes.