Oxygen Sensor There are actually (4) O2 sensors on your truck. If you look inside the wheel wells behind the fender liner, right about where the frame is one O2 sensor, the other is underneath the truck about half way back in relation to the transmission. If you see where the exhaust joints together, you went about 6" too far.
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions. You will need; Oxygen Sensor Socket Anti-Seized Penetrating Oil Sometimes it will take 15 minutes or take a few hours it depends on your luck…
Bank 1 is the passenger side exhaust pipe that leaves the engine and turns into your catalytic converter and extends to the muffler and ends as exhaust pipe on the passenger side. Sensor 2 would be downstream and behind or after the catalytic converter. Bank two is driver's side, and sensor 2 again is the sensor after the cat.
left exauhst pipe behind the Catalitic converter
where is bank1 sensor2 on the 1999 Mitsubishi montery sport 3.5
that is the oxygen sensor on the exhause manifold.
Where is the o2 sensor on an o4 hyundai sonota 4cyl bank1 sensor2
Pass side, after the converter.
Bank 1 On the passanger side sensors Sensor2 the bottom O2 Post CAT sensor
location of the O2 sensor heater on a 1998 GMC 5.7
Look behind the driver wheel at the cranckshaft pulley. There will be a sensor there. It is the pulley with the teeth.
o2 Sensor Circuit High Volts (Bank2 Sensor2
It's on the driver side. Behind the grill.
Bank 1 is on the same side as #1 cyl (right/passenger) side, bank 2 is the left/driver side. Sensor #1 is BEFORE the cat. convertor, sensor #2 is BEHIND the cat, so Bank 1, sensor 2 is the sensor BEHIND the convertor, on the left/driver side. bank 1 is actually on the drivers side