Where is the 02-sensor located?

Hi,

Both oxygen sensors are located in the exhaust system. Sensor 1 (upstream) is before the catalytic, mounted in the exhaust manifold.

The downstream sensor, sensor 2, is right after the catalytic converter. If you look at the pic below, in red, I circled the one you asked about, the downstream.

Here is a link you may find helpful. Note: These can be difficult to remove because of corrosion. They can become very tight and hard to turn. Additionally, you will need a special socket to remove it. Most parts stores will lend one to you.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Let me know if this helps.

Take care,

Joe

See pic below.