Thanks for your conclusion. I ordered the new MAF and will install on Wednesday. With the replacement part on it's way, i cleaned the old one, and disconnected to battery for 30 min. Now have a P0100 pending (I didn't start cleaning until I had the order confirmed). Problem will be solved in 48 hours.

Curious: is KPA on the scanner kPa (thousand Pascal), where 100 is equal to 1 atmosphere (bar)?

It seems that Fuel Trim 3 & 4 do not correspond to anything in ME 2.8 and are not diagnostic values. Am i close?

I thought a Phd would help to understand these systems. By your moniker, I now realize it is required.