O2 sensors are always screewed into the EXHAUST system. Look at the exhaust from the engine alway back to the muffler and you will find them.
where is the O2 sensor on a 2002 chevy trailblazer
in the exhaust system
where is the oxygen sensor in a 1995 gmc jimmy
The sensor is located in the rear exhaust manifold.
Please specify what engine 4.8
Under the dog house
in the engine
There are several and they are all located on the exhaust system.
The oxygen sensor on a 1989 Chevy Celebrity is located in the rear exhaust manifold on top about the center.
The oxygen sensor is in the middle of the exhaust manifold near the firewall.
just ahead of the catalytic converter
the oxygen sensor is in the exhaust manifolds, there should be one for each side