At 76,000 miles I changed spark plugs on my 400E, and the old plugs condition indicated a rich fuel mixture, so I decided to change oxygen sensor.
Yesterday I started detailing my car, and I decided to pull a couple of plugs for inspection and it is still indicating a rich fuel mixture (92,000mi). I would like to learn/correct this problem, but I’m not sure what to do, or how to hunt down this problem, need special tools, or is this one for the dealer?
Thanks, enjoy your drive, timreid

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timreid
1992 400E
euro lights
500E sway bars
210 16in wheels