Thread: oxygen sensor
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Old 08-29-2001, 10:48 PM
JimSmith JimSmith is offline
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

If you find the catalytic converter, the oxygen sensor is located just upstream of it and looks like a little plug screwed into a raised boss on the exhaust pipe. It has a wire coming out of it that goes up to the computer. When the catalytic converter is new (from the factory) it has a heat shield around it that also obscures the oxygen sensor. The likelihood someone replaced the catalytic converter if it was poisoned is pretty slim, as they are frequently bypassed or replaced with blanks in this country and they inspect for them regularly in most states now. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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