Correct, while I was replacing my top timing cover seal, fan clutch, bearing bracket and both hoses that connect to the idle control valve I had the air flow meter out I cleaned the Throttle body surface and installed a new gasket. I checked the TVS but I must admit at the time my car had been out of action for a week and I couldnt afford to keep the rental anymore so I couldnt continue to diagnose the problem properly but my next project will be to diagnose the wiring harness to the TVS. I also have another unit I picked up from a junk yard and could possibly salvage the switch from it.

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM