Just purchased a 2002 ML320 and here we go. I have to admit, probably have spent way too much time on this forum already, but what a resource. It has been invaluable in getting my 300e to 230k.

For the ml 320-Key locking problems-must be a bad actuator, funky blower function-most likely a control motor. Bad hatch struts-replaced easy. Some paint chips and light corrosion - a bit of body work no big deal.

What is curious to me is the following: The access to a MB competent scanner sounds like either a ton of money or trips back and forth to a shop. Is it true that even if a failed component is replaced, function may not be restored due to stored codes, or will these be over ridden by new component? Does this depend on the component? Sounds like transmission codes need to be erased.

The whole problem solving paradigm using the forum, suggests that experience from the group may be more powerful or even replace need for scanner to diagnose, ie. common failures, symptoms, part examination, can usually lead to isolation and identification of the failed component.

Replacement of the failed component is usually straight forward following MB protocols from All Data, or even better prior experience on the forum. But alas, if this is not sufficient due to need for code erasing, than a scanner is truly needed for the DYIer.

What has been most peoples solution to this dilemma? How many have gotten by without a scanner entirely, and what are the cost effective solutions for obtaining a suitable scanner. I know that DAS is outside of our control, but what about everything else? Can all systems be accessed by the OBD port, or do you have to actually connect to each computer subsystem?

Does anyone know of a good resource that discusses in depth the scanning and diagnostic systems of MB on a technical level that would be useful in further understanding the details of the system?

Thanks,

Marty