S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Need help finding the 02 sensor wire...

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Old 01-04-2010, 12:49 PM
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1987 420SEL
Need help finding the 02 sensor wire...

When I picked up this 83 500SEC the exhaust had fallen off the car so I have been searching for the 02 sensor wire to hook up for the new exhaust. I found a single, curled up white wire that goes through the tunnel that is not connected to anything so I am going to hope that is it.

Can anyone confirm this is the 02 wire?

Old 01-04-2010, 06:16 PM
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1991 560SEC Teal 1989 420SEL Ice Blue 1984 500SEC White
Hi
It is either a 2 or 3 wire set up. Ther 3 wire is for the heat to the o2 sensor.

Are you sure you had one on it?

My 84 500SEC does not use one no cats were on it when I got it from the original owner.
Old 01-04-2010, 06:37 PM
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1987 420SEL
Hmmmm well parts websites list a single wire 02 for these cars but since I cannot find wiring diagrams or anything I was just under the assumption these cars have 02s.

But seems the word is no 02, so that works too. Thanks!

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