Just what is it that you expect to find. There are reams of pages on the P0173 codes and all the v6s are basically the same: C280, E320, ML320. The v8s also have the same situation in E430, ML430, etc.

If you aren't able to understand the concepts involved, what else would you like. Are you doing your diagnostics using the Blue car method? The blue car method states that the last time a blue car acted like that it was an AMM. I gave it to you both ways, but I suppose the Blue car method is really based on a statistical approach, so one answer isn't enough. Now that I have expanded the description of the Blue car (e320 Ml320 etc) you should be able to find the statistical answer to the Blue car technique.

Using anything but the Blue car approach will require understanding the concepts involved and finding access to the tooling required to accomplish the testing required. The only reason I point all this out is that using AZ as your info and tooling source you are stuck using the blue car technique.

The article was writen for professionals and many on these pages will figure out the concepts, there are some really great DIYers here. If you wish to use the blue car approach for fun you will find it an expensive hobby.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician