[finsout]

Are there really FOUR O2 sensors on an 01 wrangler 4.0?

[Shorty]

Not 100% sure but my 01 grand cheerokee has 4 I think there are 2 before the cat and 2 behind or something.

[JFM626]

I think on an 01 there is only 1. You can check by crawling underneath and looking where the header comes off the engine. If you have cats there, you will see two large bulges. There will also ge an o2 sensor just down stream on one of them. There is also a cat just before the muffler. I think the most you can have is three, not four in any event.

[finsout]

i got the error p152 on the check engine light which indicates that sensor 2/1 (second front i believe) has high voltage. would you recommend replacing just that one or all?

[digitalcox]

Not sure on an '01 but I know for sure there are four of them on my '04.

Have a good one,
Justin