I wanted to check with you if there was a maintenance schedule on the M103from Mercedes? Like milage or anything when it was to be replaced. I have a 1991 190E & wanted to know if the mustang O2 Sensor would work in it like the 1993 190E someone mentioned they used it on? Also, what kind of telltale signs the O2 Sensor might effect on the cars persormance etc?

when your gas mileage tanks...time to replace.

easy diy.... you can get generic bosch... i think about 30-35 dollars

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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


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Usually around 100k miles...At $35 if you have any thought that it could be original, I'd replace it. If it is getting old the refresh rate could be slowing. You can always probe it and see whats going on although it may be easier just to replace it.

1990 Mustang GT Bosch sensor ~$35.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Do you just need to make sure on the bosch replacement that if mines a 3 wire the one replacing is a 3 wire & cut the wires to match the original one on the length?

Bosch O2 sensors come in 3 distinct recommended replacement intervals - 30k, 60k and 100k miles. Yours is a 60k.

Yep. It is exactly the same sensor. MB just charges an extra $100 for the connector basically. Just splice it in.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Will that same Mustang O2 sensor work for a m116?

One of our 420s is using quite a bit more gas, and it's about time to figure out why. Will be getting a Mustang one for our 300SE sometime soon though.