When the engine is running, but the vehicle is not moving, a rattle heard from beneath the vehicle could indicate that one of the exhaust catalytic converters has failed. The substrate (the internal part of the catalyst that reduces emissions) can loosen and bounce around inside the canister section of the converter—the defective unit will need to be replaced. If this problem is ignored, the substrate can break down and reduce to a size that plugs the outlet pipe, which will cause a sudden loss in power.
Rattle From Beneath Vehicle on Mercedes-Benz CLK430
Average mileage: 61,150 (11,000–91,000)
17 people reported this problem
6 people shared problem details
2002 Mercedes-Benz CLK43035,535Visitor
I STILL THE PROBLEM. DOES ANYONE KNOW HOW MUCH THE REPAIR WOULD COST?
2002 Mercedes-Benz CLK43085,000Visitor
rattle under car, took it to a local muffler shop and said back passenager side cat is bad.
2002 Mercedes-Benz CLK43070,000Visitor
It rattled while hitting gas. I put an American made aftermarket. (Thunderbolt)
2002 Mercedes-Benz CLK43027,000Visitor
Still have not fixed it. There is an EPA warranty on this, depending on the mileage, but they wouldn't cover it because my vehicle (which I purchased used) came in through Canada.
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