I'm also going on history where the diagnosis was a PITA. Granted, that was on my W124 with OBD 0.1, and the computer was able to compensate for several minor problems until the MAF failed as well. Then it threw off several "red herring" codes until I finally nailed the real culprit: MAF.

I had just read another post where someone was dynamically testing the MAF for flow rate and it got me thinking that I should just replace it to pre-emptively strike at another MAF diagnosis quagmire. If the things would just clearly fail, then no big deal, but the failure likes to creep in on little cat feet.

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Prost!