1991 Other Mercedes Benz Models Oxygen Sensor / Check Engine

Tiny
CAPTAINRAINE
  • MEMBER
  • 1991 MERCEDES BENZ
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Two questions:

1) Where is the oxygen sensor located and how do I change it out?

2) My check engine light is on and after some very rainy days the car had trouble starting up. It would crank - but not "turn over". After pumping the gas pedal a lot it started up and ran fine. Would very much like to fix this myself!

Thanks!
Wednesday, December 19th, 2007 AT 6:38 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
The o2 sensor(s) are located after each exhaust manifold before the catalytic converter, also there may be one or two after the catalytic converter.

On a warm hot day start the car up and slowly spray mist of water on various parts of the car under the hood, one bit at a time, if there is a short you will see it sparking or the car will start to die down, post back the results.
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Wednesday, December 19th, 2007 AT 7:48 PM

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