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Old 04-16-2003, 10:56 PM
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Join Date: Feb 2003
Location: Niantic,Ct. Attawan
Posts: 143
02 sensor light blinked on a few times

Hi! Searched threads, but to no avail. (user error?)
Light blinked on for a few seconds twice today w/in 3 minutes. Never again.
02 sensor on the way out?
Where is it?
How much is it?
Can an idiot replace it?
Will I get stranded if it goes?
Thanks for any help!
1985 190E

Last edited by Mel Weaver; 04-16-2003 at 11:01 PM.
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Old 04-17-2003, 10:14 AM
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Join Date: Dec 2002
Posts: 305
OK I'll answer what I can..

1.. Probably
2.. Scewed into the exhaust pipe before the catalytic converter
3... ?????
4... Probably it's pretty easy unplug, and unscrew
5.. absolutely not
89 300SEL Money Pit

92 Blown Buick Ultra Pimpmobile 220K and adding 1K per week

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Old 04-17-2003, 01:47 PM
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MTI MTI is offline
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Join Date: Nov 2002
Location: Scottsdale, Arizona
Posts: 10,627
Mel, has the sensor ever been replaced? My guess is no, since you still have a bulb in the holder. In the '85, there is an O2 sensor dash bulb that is actuated by the odometer at approximately 60K miles. It's a non-resetable switch, so the service manual instructions are to "remove the bulb" which is somewhat akin to my favorite practice of cutting a piece of electrical tape to cover a glowing "idiot light" but I digress . . .

The Bosch O2 sensor at the dealership will run you over $100, BUT, if you search here you'll find out that the Ford Mustang 5.0 uses the identical Bosch part (you'll have to splice your own wires and use heat shrink tubing) for under $50 at the local FoMoCo parts place. Or, has a full kit with a non-Bosch sensor for $50.

If you know which end of a wrench or ratchet does the work and can get under the car safely, it is a DIY job, much like swapping out spark plugs (remember to use anti-sieze compound)

One feature of the '85's CSI fuel injection system is that if the electronics (the computer connected to the sensor) fails, the system defaults to mechanical mode. The engine will run really rich and you'll notice it, but you will be able to drive the car safely.
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Old 04-18-2003, 12:08 AM
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Join Date: Feb 2003
Location: Niantic,Ct. Attawan
Posts: 143
Thanks guys! I really appreciate your thoughts, responses, etc.
FYI light hasn't come on in over 150 miles of driving since yesterday.
Thanks again!
Have a nice Holiday!
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