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Date registered: May 2006
Vehicle: 2001 E320 - Brilliant Silver/Ash: 107,000+
Location: West Virginia, USA
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Quoted: 5 Post(s)
Len is correct (plugs are 5/100,000) and that's when MB says to change them. Mine went 8/80,000 with absolutely no problem.
To the best of my knowledge your spark plugs were not bad enough to cause any of the cats to fail. One of mine failed at 7/72,000 with the original plugs but nothing was said to me about a cause, and they should have had full access the the service history. Whether they looked at it is a big question mark.
People have stated that bad O2 sensors will cause a cat to fail but your car is hardly old enough for those to be bad either (plus you would see a check engine light). Bosch says 100,000 miles and I've never heard how many years.
You were smart to decline all that other stuff, but I'd get a 2nd opinion to see if your power steering pump is leaking. In the mean time, keep an eye on the fluid level. You might consider a transmission service.
Mercedes Benz - Das beste oder nichts!
Last edited by Musikmann; 12-15-2009 at 09:07 AM.