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Good flow chart with diagram Mike.
Probably not MAF related. If the problem occurred soon after a little invasive washing you may have gotten the pump or a relay wet and toasted a fuse. Real easy fix. Also check for loose or damaged wiring to the air injection pump. The "signal implausible" term is a weak German/English translation for "open circuit" or "no signal" from the sensor.
Good luck with your fix. Definitely not the end of the world.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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