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Old 01-23-2003, 02:02 PM
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MTI MTI is offline
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Join Date: Nov 2002
Location: Scottsdale, Arizona
Posts: 10,626
When I had my instrument cluster out, I noticed that the O2 sensor light holder was hard wired via a green wire to a connector that seemed to be behind the speedo/odometer. It was the only bulb in the cluster that was wired that way. That would suggest that there's a switch or circuit in the odometer of our vintage cars that sets off the light regardless of the sensor's performance. If the sensor does fail, you would notice decreased fuel efficiency and perhaps some acceleration problems since the sensor is basically telling the fuel system to run rich.
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