Well last weekend I decided to get my 99 W202 C230K rustproofed for the first time since it never seen the snow and it will now.

A few days later the Check engine came on...car acting the same and just had the codes read today....shows MAS airflow sensor.

My mechanic was guessing the spray from the rustproof got sucked into the intake and now ruined the MAS sensor.

Im going to get a new one tommorow but mostlikely this is true u think?

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99 C43
98 S420
99 C230K
01 C240