My dad has a 97 e420 which has an obnoxious rattle coming from under the car, about half way back. He says it has something to do with the catalytic converter, and it is a big, expensive job to fix. It only makes the noise when the car is in gear, not when it is in park. Anyone else experienced this type of problem? Something doesn't seem right to me, but I can't really go under there to check it out because it would seem as if I was second guessing him. Thoughts?

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headrivenoise... listen.

Sounds like possibly a heatshield.
You'll just have to look under the car when your dad is sleeping.
Put a sleeping pill in his drink, if you have to.

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2007 C 230 Sport.

I had a similar rattling in my car, and it was the heat shield.

Only took a few bucks to have it welded back in place.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

Get some steel wire, baling wire, and wrap it around the shield. That worked on a Ford Explorer I once had.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

On a Mercedes ? Shame on you.

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2007 C 230 Sport.