There are usually two of these sensors, both are located on your exhaust system, one before the catalytic converter and one after the catalytic converter.
in exhaust pipe in front of muffler / catalytic converter, changed mine yesterday.
How to replace o2 pre converter gmc 1500
Remove the vacuum hose from the O2 sensor. Remove the wiring harness. Remove the O2 sensor retaining screws. Reverse the process to install the new O2 sensor.
location of the O2 sensor heater on a 1998 GMC 5.7
The sensor is located by the catalytic cnverter on the inlet side.
it might be on the y pipe right before it splits, use ramps or jack to see it from the bottom.
Start at the exhaust manifold and follow the exhaust pipe toward the rear of the vehicle and you will find the O2 sensor.
driver side first o2 sensor
That would be the O2 sensor located after the catalytic converter.
No. The O2 sensor is only in effect once the computer goes into closed loop mode (usually after engine is up to temperature)
the O2 (oxygen) sensor on a 93 gmc is in the left down pipe of the exaust Y pipe
the o2 sensor is on the passenger side, in between the chassis and the body, just after the cat...careful replacing that. have the required lubricant, ask your dealer, because it needs to be air tight.