C270 W203 Catalytic converter

HelpThisDude

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Your Mercedes
W203 C270CDI, R172 SLK55 AMG
Hello all.
My C270’s (W203) catalytic converter, (the one under the pass compartment) has been rattling always for a while.
When I enquired on changing it, I was informed that I had to change both converters, as the cat near the turbo would have caused the lower one to fail.
Is this true?

Cheers :)
 

type49

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Possibly. The front cat is more likely to fail but you can't tell unless you remove them both
 


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