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Old 01-15-2003, 07:57 PM
420benz's Avatar
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Join Date: Jul 2001
Posts: 961

How many wires are there on the o2 sensor in my 89 420 sel and can i replace it with a 1990 ford mustang 302 sensor?
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Old 01-16-2003, 07:34 AM
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It's very possible that you can use an alternate sensor. Everyone I've seen has the same voltage curve. All the MB sensors I've seen have three wires and two connectors. The connector with one wire is the O2 signal wire. The connector with two wires is the heater on the sensor.

I think if the sensor will screw in place and you get the wires right it will probably work.

That said, I'm not sure I would do it, but in this day and time, I certainly understand steps to economize.

Best of luck with it and let us know the result.

Have a great day,
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Old 01-16-2003, 11:54 AM
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
If you use the search facility, this has been covered several times. Yes, you can use the Ford Mustang sensor. Someone posted how to build a wire adapter to convert between the sensor and the Mercedes connector so that the next time you do it, it's just plug and play, regardless of whether you go back to the Mercedes sensor or continue with another Ford sensor.
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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Old 01-17-2003, 09:33 AM
420benz's Avatar
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Join Date: Jul 2001
Posts: 961
Thanks guys! I have the info on the o2 sensor but did not know if it pertained to my car. THANKS
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