S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Knock come from the Transmission or Exhaust system

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Old Apr 11, 2008 | 11:23 AM
  #1  
sessayan's Avatar
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From: Valencia, CA
2002 S430
Knock come from the Transmission or Exhaust system

Has anyone had their S making a Knocking noise coming from either the tranny or the exhaust system?

Everyone tells me I got a pretty bad Knock and I know I need to take it in but its being going on for three months and hasn’t really showed up in performance or gas millage or really anything other than the Knock.

Just wondering if anyone has had this issue?

Hate taking the car in because of the down time.
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Old Apr 11, 2008 | 12:32 PM
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my06clk's Avatar
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04 S430 (sold),05 X5 4.4i, 02 325i, 87 560SL, 85 Alfa Romeo
Originally Posted by sessayan
Has anyone had their S making a Knocking noise coming from either the tranny or the exhaust system?

Everyone tells me I got a pretty bad Knock and I know I need to take it in but its being going on for three months and hasn’t really showed up in performance or gas millage or really anything other than the Knock.

Just wondering if anyone has had this issue?

Hate taking the car in because of the down time.
98% chance you have bad catalytic convertor(s).
they are covered to 10 years 80K so have the dealer check it out ASAP..
this is a common failure with these cars for some reason.

I had mine done last year..
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Old Apr 11, 2008 | 01:04 PM
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sessayan's Avatar
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From: Valencia, CA
2002 S430
Thanks for the info.

Got 66K miles on the car so I should be good to go.

Still creates downtime!! I hate when they give me a C class.

Unless I get one of the new ones but I doubt they will.
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Old Apr 12, 2008 | 12:23 AM
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AH1W-COBRA's Avatar
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From: california high desert
2003 S500, 03 C240, 03 E320, 03 tahoe
we are spoiled rotten

Originally Posted by sessayan
Thanks for the info.

Got 66K miles on the car so I should be good to go.

Still creates downtime!! I hate when they give me a C class.

Unless I get one of the new ones but I doubt they will.
imagine us complaining about the C class but it is an absolute reality when you have an S class for a daily driver.the good news is you can park the C anywhere and not have to worry about door dings.
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