Where is the oxygen sensor in a 2002 nissan frontier & how do I change it?
I’m looking to replace my oxygen sensor but I’m looking to buy the part online and I see “before catalyst” and “after catalyst” oxygen sensors…. which one do I need, where is it located, and do I have to take it to a shop or can I do it myself? A: If you look at your exhaust pipes and follow it down, there will be what looks like another spark plug connected to the exhaust pipes / headers / manifold. This is the O2 sensor. You will need a special O2 sensor removal tool. It can be rented (or loaned) from Autozone for free (most of the time). There’s another one just like it AFTER the catalytic converter.
