Re: O2 sensor replacement--wire colors? - Saab 900 Bulletin Board - Saabnet.com
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Re: O2 sensor replacement--wire colors?
Posted by Paul Bob [Email] (more from Paul Bob) on Fri, 28 Dec 2007 19:25:33
In Reply to: O2 sensor replacement--wire colors?, mac, Fri, 28 Dec 2007 18:59:37
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Two of the three wires (the white ones if it's a Bosch sensor) are for the heater circuit - literally a little resistance heater that pre-heats the sensor. Polarity doesn't matter for these.
The third wire (black) has a spade lug attaching it to the body harness on most, if not all, Saabs I've seen. It's the one that generates a small voltage (from about 0 to 1 volt) as air passes over the sensor. This is a low voltage, so you don't want a lot of resistance in your splices. Don't just twist the wires together as a splice. Use good crimps and/or solder.
Paul Bob
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