The ECU is very durable in these cars. I doubt it that you could hurt it. Thr airflow pot can't, of itself, hurt the controller. Running twelve volts down the ground wire would do it in, but any partial of the sensor voltage will only be misinterpreted.

BTW the airflow sensor part# 103 074 01 14 was more than I thought at $462 MB list.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician