Are there any tricks to replacing the oxygen sensor in a 95 S420? And where is it, same general area as a W126 - starboard of the tranny? Alldata suggests that the connector is outside, not under the carpet, but I can't tell what area of the car the image depicts.

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD

One of the easiest O2 sensor replacements! Every thing is under the car.

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Nothing to it.... 5 minutes top if you have the right tools. I used a 02 socket and long breaker because it was really stuck. 100K miles and never replaced. Car idles a little smoother and I am checking for a gas mileage increase.

about 4 months ago at 105K miles and since then, the gas milage went up to as high as 16mpg city driving. Typically it's 15mpg. Very pleased with that result!

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Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page

Everyone with a 560 SEL PLEASE respond ! ! ! My 1988 560 SEL
doesn't have a warning light in Dash Console even though MB
CD says it has light . The light should be red lensed and have
space next to SRS (with other words :#1 starting from right to left ) .I don't have this light and when I took out Dash console there was wire with bulb and when I looked through the hole for warning light there is just red lens with nothing
written on it !!! Now , how do I know if O2 sensor is bad ?