98 Cabrio wet instrument panel wiring
 

In a heavy rain my son's 98 cabriolet instrument panel malfunctions showing no RPM, oil light on etc. even though car is running, what causes this

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You need to check for water ingress. You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing.

Hi Keith,

I didn't realize that. I am inquiring for my son. He has no interest in cars, so I thought I would lend a hand. I will see if can get the error codes