How do you replace Oxygen Sensor 2 on a 1998 Nissan Frontier?

Answer 1

I just replaced mine the other day and found out that it is pretty easy. The hardest thing was getting the right parts. You will need to get the o2 sensor remover. It is about $12 at schucks or autozone. I tried to get it out without it and it wasn't happening. The attachment for it is 3/8 inch, so make sure you have a 3/8 inch socket wrench. The first sensor is located in the engine. Pop the hood and check on the right of the engine. There will be a little wire plugged into something that looks like an over sized spark plug. You can unplug the battery, might be smart since you are dealing with electricity, but I did it and it without unplugging it and it wasn't a problem. Unplug the wire. Once it is unplugged, attach your socket to the sensor and twist. It should take a little effort because you only have to change them out about every 100,000 miles. Most of the new one's come with a lubricate already applied, if yours doesn't, then just ask the worker at the auto store and they will show you what one you need. MAKE SURE YOU DON'T TOUCH THE TIP OF THE SENSOR!!!! Any smudge or dirt will mess up you sensor and make more work for you. Once you have the old one off, screw the new one one, tighten it down, then reconnect the wire and your battery if you need to. You should only have to change out the upstream sensor but if you do have to change out the downstream sensor, it is pretty much the same process. Find your down stream sensor, it is located right after you catalytic converter. The downstream will have a long wire that will go follow along the frame of your truck. Follow it until you find where it plugs into. Pull on the plug until it pops out. Go back to the sensor and unscrew it using your socket and wrench. Once it is out, take your new sensor, again DO NOT TOUCH THE SENSOR, and screw it in to its respective place. Run the wire back through the frame of the truck and plug it right into where you unplugged the old wire. FINISHED. If you have a check engine light on, don't worry it will turn off eventually. If it doesn't, just go to schucks or autozone and have them hook up their diagnostic machine and it should turn it off. They will do it for free. The whole process is really painless. I think it took me a total of 20 min to do both and I think it only cost me about $150. That is for the socket, the upstream and the downstream sensor. I know that sounds like a lot of money, but when you consider a mechanic will want to charge you anywhere between $600 and $800, I know because I asked before I changed them out myself, it is really saving you money and you won't have to do it again until another 100,000 miles.