Welds May Crack on Front Catalytic Converter on Mercedes-Benz ML320

Submitted by Vehicle Owner · Oct 7, 2025

Published by RepairPal

Problem overview

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.

42 people reported this problem

19 comments

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Mercedes-Benz ML320 vehicles with this problem

7 model years affected

2003 Mercedes-Benz ML320

2002 Mercedes-Benz ML320

2002 Hyundai Elantra

2001 Mercedes-Benz ML320

2000 Mercedes-Benz ML320

1999 Mercedes-Benz ML320

1998 Mercedes-Benz ML320

2003 Mercedes-Benz ML320

2002 Mercedes-Benz ML320

2002 Hyundai Elantra

2001 Mercedes-Benz ML320

2000 Mercedes-Benz ML320

1999 Mercedes-Benz ML320

1998 Mercedes-Benz ML320

Average mileage: 125,614 miles

(54,545 - 200,000)

Repairs related to this problem

Catalytic Converter Replacement

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