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Old 01-17-2008, 07:20 PM
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Join Date: Jan 2008
Posts: 1
Intermitent oxygen sensor light trouble!?!

Hi i have just recently bought a benz 300E 1987, and the oxygen sensor light stays on after i start the car, after the car gets warm it eventualy goes away, and sometimes it comes back...Does anyone have an idea on what this can be related to, or how to fix the problem?


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Old 01-18-2008, 08:03 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
On a 1987 300E the O2 lamps comes on IF there are 5 minutes with out any O2 sensor activity.

Possibly a mis-adjusted fuel mixture OR a bad sensor.
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Old 01-18-2008, 08:38 AM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
this happened to me over the summer.... when the weather got cooler...the light never came on again.

i replaced the sensor a couple of weeks ago.....

this was on the 260e.... i do believe the sensor had been replaced before with an OE type... I am basing this on the fact that it unscrewed easily from the cat... it had anti seize on it..

I do not know how old it was... i have limited service records from the previous owner.... the old one appeared to have carbon on it..but did not look too bad.

i spliced in a 3 wire replacement that i had picked up for about 30 dollars....

1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


Last edited by lee polowczuk; 01-18-2008 at 08:45 AM.
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