In the exhaust manifold or near the pipe, must raise car to get at it . better to work on when engine is cool,easer to to remove and you won't get burned.use never sieze if using old one again (new ones already have it on ) simply unscrews with wrench, do not force may damage threads
When I had that problem on my 1997 buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.
The upstream O2 sensor on a 2001 Buick LeSabre is located in the exhaust system, specifically before the catalytic converter and typically mounted on the exhaust manifold or the front pipe. To access it, you may need to raise the vehicle and work underneath, as it is positioned along the exhaust pathway. It usually has a wiring harness connected to it, making it identifiable. Be sure to take necessary safety precautions when working on the vehicle.
On a 2001 Buick LeSabre, there are typically two oxygen (O2) sensors. The upstream O2 sensor is located before the catalytic converter, attached to the exhaust manifold, while the downstream O2 sensor is positioned after the catalytic converter in the exhaust system. These sensors monitor the exhaust gases to help optimize fuel efficiency and emissions. To access them, you'll need to lift the vehicle and may require special tools due to their location.
It has a conector, just un plug it. Then remove the 02 sensor from the exhaust.
replace them both, if u reset n sends bad code replace otherone 4 real or go 2 a shop n spend 74 - 100 4 diagnostic
02 sensor problem
Check your battery cables. Some computerized vehicles have to be reset. Disconnect the battery for about 5 minutes and then reconnect.
Disconnect positive cable first then negative. Reconnect the negative cable first then positive.
Bank 1 sensor 1 was the upstream 02 sensor located before the catalytic con on my 03.
LOCATE THE SENSOR IN QUESTION THEN WARM THE ENGINE SLIGHTLY TO MAKE REMOVAL OF THE 92 SENSOR EASIER THEN USING A 02 SOCKET OR 7/8 WRENCH LOOSEN THE 02 SENSOR AND REMOVE IT ALSO DISCONNECT THE WIRING CONNECTOR.
First you need to find which one is bad. After you find out which one is bad you remove the 02 sensor from the exhaust pipe with an 02 sensor socket. Then you disconnect the sesor from the electrical connector. After that you can install the new one. Be carefull it's not the easist job to do in the drive way.
where is the secondary 02 sensor on a 2004 crv