Car Problem Reports

Mercedes-Benz CLK430 Failed Exhaust Catalytic Converter May Cause Rattle From Beneath Vehicle

 
Mercedes-Benz CLK430 Problem
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Model Years Affected: 1999, 2000, 2001, 2002, 2003

Average Mileage: 60,044 mi (11,000 mi - 91,000 mi)

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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.

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