Where is the upstream O2 sensor located?

Hello FLIP373,

You will need to remove the air inlet pipe and the engine cover. It is located behind the engine on the exhaust manifold between the engine and firewall.

I am adding a couple of pictures for you. You will need a mirror or an endoscope to see it. You could use your phone as well.

I will continue to look for a better picture for you.

Thank you,
Brendon