Mercedes SL exhaust noise issue

Ah, the dreaded exhaust flaps! I had a similar issue with my Mercedes CL, though mine's a bit older. Louder exhaust noise is definitely a telltale sign. The flap actuator is almost always the culprit. Are you getting any specific error codes? If the flaps are stuck open, that'll definitely cause the increased exhaust noise, especially on cold starts. Those flap actuators are notorious for failing. Sometimes it's just a bad connection, other times the actuator itself is kaput. Did you check the wiring harness to the exhaust system for any corrosion or damage? It's worth a look before you start throwing parts at it!

I have not yet examined the wiring harness. Can you elaborate on the error codes you encountered with your Mercedes CL? Were they specific to the flap actuator, or more general exhaust system errors? Also, did the increased exhaust noise occur only during cold starts, or was it persistent?

The error code was pretty specific – something along the lines of 'Exhaust Flap Actuator Circuit Malfunction'. I don't recall the exact code, but it pointed directly to the flap actuator. The increased exhaust noise was more noticeable on cold starts, but honestly, it was always a bit louder than it should have been. Once the engine warmed up, it was less pronounced, but still there. Given your symptoms and the error code, it really does sound like the flap actuator is the prime suspect. Honestly, save yourself the headache and just take it to a reputable workshop for an exhaust repair. Messing with the exhaust system can be a real pain, and those flap actuators can be tricky to replace properly. It's probably the quickest way to get it sorted, especially if you are not familiar with the exhaust system.

I appreciate the advice. I will consult with my local workshop to arrange an exhaust repair. The anticipated exhaust repair cost of approximately 190€ seems reasonable. I trust that replacing the defective flap actuator will resolve the issue and restore the exhaust noise to its normal level.