Exhaust Leak From Front Catalytic Converter on Mercedes-Benz ML320

An exhaust leak may develop due to cracked welds on the front catalytic converter. Replacement of the catalyst is recommended; re-welding of the catalyst is discouraged because it is an emissions device.

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Average mileage: 120,143 (54,545–200,000)
6 model years affected: 1998, 1999, 2000, 2001, more2002, 2003
29 people reported this problem
13 people shared problem details
Catalytic converter was replaced. Paid for by dealer, even though I was out of warranty. (apparently it was a known issue)
3 people like thisFlag inappropiate
loud noise when starting vehicle, sounds like a cheap motorcycle! Calling dealership today for an appointment.
2 people like thisFlag inappropiate
Not covered under recall, have not yet fixed problem. Thinking of welding.
1 person likes thisFlag inappropiate
Small crack on top of cat. Some exhaust leakage, but very minor. Did not affect operation, did not repair.
Check engine light came on and car stalled out. Had it towed to garage and had a cracked catalytic coverter! $1500 paid to install new one! Should Mercedes hav covered this?
notice a noise getting louder. took it in to Mercedes dealership, 2 hairline cracks. one on each side. have not got repaired yet.
Very expensive to replace!!!
Driving on highway doing 80 mph when the engine light comes on and the car slows to 40 mph. Went to a local service station and was told that the real convertor cracked. Both back convertors now need to be repaired at a price of $430 each plus labor.
all catalytic converters failed, without know reason or problem. regular scheduled maintenance performed on vehicle
put put sound under car, passed emissions, took to Meta Motors for diagnosis, did not fix, sold car
The passenger catalyctic converter is leaking and starting to leak in the driver's side giving a weird noise.
center panel covering bubbles and is coming off.
Couldn't afford to replace it. Did weld it. Now car w/143,000 miles on it and check engine light due to emissions!
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