Well reported!

Does the AIR work when you start the car cold? In any regard, check the vacuum connections to the AIR pump; make sure that all is ok. Also check the changeover valves that drive the pump.

The "lambda" system not working; check the MAF for contamination, see MENU#4a. Try to clean it and what happens. The Hot Film ('95) versions don't seen to clean as well as the Hot Wire ('94), so it might have to be replaced.

Don't overlook the "brake switch" and "neutral safety switch"; easy to replace and can (do) cause Lambda problems.

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Regards . . . . JimF
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'94 S500 Cpe

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