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?

Thanks

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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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....

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1989 300ce 129k
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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


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