Question about 1989 GMC Sierra
Follow your exhaust pipe/pipes leaving the engine in a rearward direction and the O2 sensor will be just before the catylitic converter sticking uup with a dual or triple wire harness. Possibly it may have only one wire, there are several configurations. It is removed by turning it counterclockwise. Reverse to install. Thank you, Dana
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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Removal & Installation
WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
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