Question about 2002 Chevrolet TrailBlazer
No worries mate. locate it in the exhaust system. it's in the manifold, or any exhaust pipe. it screws in like a spark plug and has anywhere from 1-4 wires on the electrical connector. unplug the connector. remove sensor with wrench, usually 7/8" or 15/16". you can even buy a socket for it at any auto parts store. install new one and plug in. don't worry about disconnecting or resetting anything else. the light should go off within a few miles. but if you're in a hurry for that or have a problem, most auto stores can clear it for you.
Posted on Sep 14, 2010
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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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P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
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