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Oxygen sensor - I'm baffled 200 1989

It's the #4 fuse in the panel by the front door where all the fuses are. The only other thing on that fuse is the in-tank fuel pump, which you might not notice isn't working. I checked the O2 sensor voltage at the one wire connector under the hood near the hinge. Just peel back the rubber cover and attach the voltmeter probe to the connection. The 2-wire connector is for the heater - one wire is 12 volts, the other is ground. Measure the female end of the connector.






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