What did you do to your TJ today?
- Thread starter LJRubiconGuy
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hoovskins
Member
Couldn't find the "what i'll do to my TJ tomorrow" forum so I'll ask here.
Code P0158. And i did see where I'm to replace 1,3 or 4 O2 sensors. I'm a 2002 with the 4.0. How many am I replacing please. And must use NGK
Code P0158. And i did see where I'm to replace 1,3 or 4 O2 sensors. I'm a 2002 with the 4.0. How many am I replacing please. And must use NGK
Went scouting for trash in the woods in preparation for an Earth Day weekend cleanup...hosed off the Jeep and more WD-40 in the speedo sensor plug to displace water from snow wheeling over the weekend...and tightened a couple of retaining bolts on the track bar and rear control arms.
Kiwi TJ
I don't suffer from insanity I enjoy every minute
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After being the last person on earth to watch Game of Thrones I finally have a name for my Jeep
I’ve never watched it.
I realize that I didn’t post it here, but the seat latches were already broken from the PO putting it in. I thought it was just stuck when I first posted today, but they were mangled beyond help. I only resorted to yanking and cutting once I realized it was broken. I didn’t just destroy a perfect seat.I'm glad you got it out! But, man, it hurt to watch that...
MountaineerTom
LJ Enthusiast, Retired USAF Weapons Loader
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I don’t remember where I got this. Somewhere online. I just got it thinking it would be good to have on hand if I ever need to check mine. Someone here probably knows what you’d need to make your own.
A 2002 4.0L should have 4 O2 sensors. 2 for each bank of manifold cat convertors.
let me know how you get to the upper ones. I've had 4 new O2 sensors I haven't put in yet
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The shop probably buys their starters from Autozone, or likely Napa... which will last about 2 months longer lol. I went through 3 Autozone alternators in 1 month on my 2000 XJ. The 3rd one I was about to throw through their window before just buying a Mopar alternator. Lifetime warranty is meaningless when you have to replace the same part 3 times. On the positive side I got really good at changing alternators on Cherokees while laying on the ground in the rain.
Code P0158 description and possible causes (caveat: these are from the 2005 Powertrain Diagnostic Procedures Manual, and are likely the same for your 2002, but the PCMs changed in 2005, so there is a chance it's different):
So, the first part of that image above tells you the why - the PCM is sensing that Sensor 2 of Bank 2 voltage exceeds 3.99V for at least 76.8 seconds. Then, the second part gives you some insight into the possible causes, which can be reduced to three things:
1. A wiring issue (shorts to voltage or open circuits)
2. A faulty O2 sensor
3. A faulty PCM (ask @Wranglerfix if the P0158 code is a common PCM problem for your vehicle)
You now have two different approaches to solve the problem:
1. Throw money at it (this is not stated tongue-in-cheek, it may be the best path for you)
2. Diagnose it properly and then replace/repair parts
There's a diagram in the first post of this Resource thread that explains which one is Sensor 2, Bank 2. There's a lot of other good info in that thread, too.
If you want more help, I'd suggest starting a new thread because this thread is very active, and posts get lost easily.