whats the difference in those numbers? i only have one upstream sensor..

 

The rear sensor has longer wiring.

 

Yeah I don't want a new rear one why would I get a new rear one when they don't do anything? hahahaha so if I just google the numbers it'll tell me up or down pipe?

 

The easiest way to get what you want is to go to any auto parts store and say you need a upper flow o2 sensor ( their computer has them all listed and numbers you need). All of them have the sensor your looking for and you can pick what brand you want from their. 8 outta 10 shops should have or can order ngk or have possibly delfi (that's what I use). I work at a auto parts store and have been working with some major companies around the metro detroit area. chances are if you order from off line you may get a defecte and have to be without a o2 sensor (sol) till you return it online and wait for them to send you one back. And it doesn't have to be a napa store ngk. Auto value, parts plus(idk if that's Michigan only) and I'm sure any other auto store can get you this price for around $50 or less.

I hope this helped

 

What are these 'auto parts stores'?

 

The front and rear 02 sensors are wired in series. If one is off, both are off.

And if you do any wheeling in water or mud I can gaurantee you your gas mileage will improve greatly with replacing the rear as well.

Make sure if you go wheeling in watermud though that you put the old one back in before wheeling or you'll damage the new one.

 

Napa is the big one that alot of people go to ( however they sometimes overcharge people) and they have like a 97% rate of getting you the right part the first time. Then you have your auto zone which idk about anyware else but it's like a 50% rate by my house you'll get those parts right the first time( be very spicific on your car info and make sure they look up a Cherokee not grand Cherokee) and the 2 stores and one factory I've worked at might only be in Michigan and those are auto value ( good because they can be family owned and hand pick the cashiers for best result) uas (warehouse distributer) and metro maxi (delivery warehouse) I've not really been to o' rileys but I've been told they have a little markup compared to napa, and pep boys which I've heard gets parts wrong a little bit. But those should be all you local chain stores. You may find some family owned places which can be awesome. If you have trouble finding any of these go to you local mechanics and ask where they get their parts. If their nice they'll tell you and you could go there

 

I am only talking about upstream sensors. My rear upstream sensor has longer wiring than the front upstream.