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2000 C280 Sport
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Discussion Starter #1
I was getting Engine Coolant Temperature Sensor faults before some repairs were made. Sensor was replaced. Check Engine light just came back on with same fault. It's been less than a week.

ALSO, my horn is not working. It wasn't working even before the repairs. They didn't address it since I had already hit my money limit with more important stuff (suspension, etc). The horn checks out OK. I'm guessing it might be the Horn Relay.

I notice that the Horn Relay is referred to as a multi-purpose relay.

Any chance the circuit for the Engine Coolant Temp Sensor runs through the Horn Relay? If so, I'll try replacing it. Might do it anyway to see whether it takes care of the horn problem.

This is a 2000 C280 Sport.

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