Question about 1997 Chevrolet Astro
The heater circuit feeds the other 2 sensors and since there is no code for them we can reasonable assume that the wiring an fuse is good up to the splice.
Bank 1 sensor 1 is the sensor before the cat on the same side of the engine as the number 1 cylinder. If you check the vehicle side of the connector you should see a black, pink, purple and tan wire. Pink is the power to the heater, Black is the heater ground. Make sure there is 12 volts on the pink wire with the key on (possibly running) and make sure the ground is good.
If those 2 are good than I would have no problem changing the O2 sensor.
Posted on Sep 29, 2010
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Posted on Jan 02, 2017
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