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This code relates to low coolant temperature not the 02 sensors. You should change your thermostat, it's stuck open and is not allowing the engine to properly heat up.
By the way, there are 2 92 sensors on Envoys and Trailblazers. One of them upstream is in the engine compartment right off the exhaust manifold, easy to replace. The other one downstream is next to the transmission drain plug in the exhaust pipe.
heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.
If you are getting the low coolant message you are looking for the coolant level sensor not the coolant temp sensor. I do believe the sensor is in the jug, is it filled to the full line?
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