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Old 07-01-2003, 07:01 PM
royaiii royaiii is offline
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Join Date: Jan 2002
Posts: 352
1) No I haven't attempted to change my filter as I think the part is buried in the dash. DIY jobs on a W140 are limited to simple maintenance procedures. Also DIY on a W140 may lead to breaking a small fitting that requires replacing an entire assembly.
2) On my S420, I had both cats replaced, center muffler, rear muffler replaced at around 45k miles because of a sulfur smell. In addition I had the MAF sensor replaced + O2 sensors. I think the best way to have the system replaced is by a muffler shop who can do the job right. Also, it is imperative to have the Mercedes or OEM cats installed as a simple electrical hickup can lead to spending thousands on diagnosis and repair. Having a lift is necessary for this job, wouldnt attempt to do this on stands. I woudnt change the cats for looks alone unless they have a functional problem.
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