BAD O2 SENSOR?? JEEP 4.0 MISSFIRE SOLVED - UPSTREAM OXYGEN SENSOR REPLACED

[@justinlonghofer]

1998 Grand 4.0….Went through the whole fuel system. Replaced fuel pump assembly and filter (all one unit inside the tank in the rear). Replaced fuel injectors. Pulled the distributor and inspected it. Went through ignition system. Replaced ignition coil, distributor rotor cap, replaced wires, and installed new plugs. These exact symptoms were my issue and no matter what key words I typed or how much I searched I couldn’t figure this out! So I went step by step troubleshooting my way into oblivion! I even replaced worn parts of my vacuum hoses. Still the same symptoms persisted! My whole top end was rebuilt too early on to these symptoms 2 years ago. Head was removed, ported…polished…new gasket. Woke up today and took it to my local mechanic who rebuilt my cylinder head and had him throw his code reader on (even though no check engine light EVER came on). Code read “cylinder 4 misfire.” )Cylinder 4 is the last cylinder closest to the windshield). So I figured- A: it’s a bad plug by chance …even though it was replaced a year ago when my head was rebuilt. And even though I also physically checked ALL plugs were receiving a spark OR B: Oxygen sensor! Typed in “cylinder 4 misfire” and your video popped up. Dude the way you described the symptoms was SPOT ON and I immediately went to the parts store and got an “Upstream sensor 1” part I snipped the wires and threw on a 7/8 impact socket onto a long breaker bar. Hoses down the old O2 sensor with weasel piss (PB blaster) and kept the Jeep running. Blocked the back tires and had it up on ramps. Laid down from the front - end side and the sensor is right there! ( Be extra cautious if you do this because the tan blade is right there above you and will most definitely fuck your day up more. Wrenched down on her pushing away from me (lefty loosey) and she came right out with some hard effort. Brace your back against the passenger side front tire for leverage. Note*. Flash reset your computer by unhooking the ground wire from the battery with a 1/2 inch wrench. Do not let it touch the terminal and go turn on your light switch on and off a few times. I also go through the motions of turning the engine on and off and hit the blinkers. Basically you are discharging any remaining power in your electrical system. Hook the ground wire back up and you are golden! Any code should be wiped and the computer will relearn your driving behavior and will adjust to the new sensor readings. Giving your better fuel economy and peace of mind. Cheers

[@beyersmaartens3665]

Been struggling 3 months with this problem and today I found the problem. Great video 🙏🏽

[@ProjectDanH]

Thank you so much! Best of luck with your Jeep!

[@Ashley-qf3gv]

​@@ProjectDanH hey I just bought a 1998 jeep Cherokee and my oil pressure goes up and down when I'm driving when you got your foot on the gas it goes to 40 and when you take it off it drops to 20 than goes back up what could be wrong with it

[@ProjectDanH]

@@Ashley-qf3gv that's not too far from normal.

[@coreycarter8469]

​@Ashley bro sell your jeep lop you know nothing

[@fogstain]

@@Ashley-qf3gv Rule of thumb. 10 psi per 1000 rpm is fine.

[@rustyintheoutdoors]

I’ve been looking for a solution for my ‘98 Tj 4.0 for 6 months!! Your symptoms/diagnosis were literally word for word the same problems I was having. Couldn’t find anything on the internet about it until now. Thank you so much sir!

[@ProjectDanH]

Glad I could help!

[@vaman86]

THANK YOU VERY MUCH ! Replaced the upstream (pre-Catalytic Converter) O2 sensor in my 1997 Jeep Straight 6 .... runs like a TOP !. No more intermittent BAD! misses like for the past few years with multiple expensive random parts replacements. Almost like getting a new car ! Also very good explanation of the function of the upstream O2 Sensor ! Thanks again!

[@ProjectDanH]

Thanks for watching Wes! Glad I was able to help 💪

[@frankiesmith8203]

@@ProjectDanH what causes 2013jeep Wrangler sport jerking almost like a miss

[@bryanatwood9803]

I can not believe this is working so far. I have a 99 Cherokee XJ and it was cutting out, rough idle and very intermittent. I did the cap and rotor, it needed it, crank sensor, cause my scan tool showed it dropping out on the graph, and now I watch this and so far it runs fine. In COLLEGE, Associate in Automotive Science, the book says that a car will go into open loop when it throws an emissions code. SOOOO, in theory it should not effect the running of the engine because it is in open loop running a predetermined set of parameters. Followed your tips and so far so good. Thank you for posting this and now I can get my Jeep back on the trail.

[@ProjectDanH]

Thanks for watching man, I really appreciate it

[@travispoulin252]

Dude, thank you for the tip. I have a 2004 wj with the 4 o2 sensors. It started running bad for a few days and tons of black smoke out of the exhaust and then over the course of a few minutes it would literally not move above an idle while in gear. I could put it in park and rev it to the limiter but once in gear the gas pedal literally did nothing. I received tons of advice from "mechanics" and they all said spark plugs, coils, injectors, IAC, TPS, clogged fuel filter and clogged cats. However none of them could explain why it idled fine and could be revved in park which wouldn't happen if they were the issue. But alas with no smoking gun I started with the spark plugs since I had never changed them in the 80k miles I've driven it and i bought it used with 99k miles and had no idea how old they were to begin with. The electrodes were severely worn down and the gap was easily twice the factory distance. So I thought that had to be it... Nope. No change. Then because of the completely dead gas pedal I thought maybe the TPS. Nope, replaced it and cleaned out the throttle body with no change. I knew from a previous check engine light that one of the downstream o2 sensors was failing and saw that they were a common problem on the 4.0 so I replaced both of them and the oil pressure sensor that was failing randomly. Still no change. I was defeated and ready to take it to a mechanic for the first time since I've owned it. But then going down the rabbit hole one more time I found your video and while it wasn't exactly the same symptoms it was pretty close and easy to test. I unplugged the 2 upstream sensors the next day and it finally drove down the road like normal. I replaced them both and it's running great now. Thank you!

[@two8252]

Thanks for all the detail. Seriously... very helpful.

[@travispoulin252]

@@two8252 Glad it was helpful. Did you have the bad upstream o2 sensors as well or was it something else?

[@shawnmaginness9872]

I've got an 02 Cherokee Laredo with most of the same symptoms. Replaced both up and downstream 02s in bank 2. Still the same. I'm about to go unplug the upstream 02 in bank 1 and see what happens... Fingers crossed! Congrats on the fix! This video is great, regardless of whether or not it works for me

[@travispoulin252]

@@shawnmaginness9872 Hope it works for you too. I tried so many things with no change and was at my wits end and was so happy after finding this video..

[@bfresh4208]

Totally solved my 98 cherokee 4.0 misfire. Thanks man

[@ProjectDanH]

Thanks man! Glad it helped 👍

[@flowermaze___]

Chasing the same thing ~ unplugged and all seems to be better! Did you replace just the one? Was it a universal sort of part (to fit an XJ of course) @slacker4320 @projectdanh Thanks for the videos, great stuff!

[@kevinschneider5268]

Retraction Please! Dan, I take it back. I left my battery disconnected overnight. My ‘97 ZJ ran GREAT all day long today and I’m looking forward to tomorrow and a trip to buy the new replacement O2 sensor. You were right all along ......I love your videos. Keep uploading...best, KS

[@ProjectDanH]

🙌🙌🙌🙌 woohoo! we did it 😁😁😁 thanks Kevin!

[@FallyFire]

Holy MOLY THAT'S WHAT'S HAPPENING. This is EXACTLY what I needed. You explained EXACTLY what I've been going through for months, but it would throw a Cam sensor code and then the code would shut off. I'll see what happens if I just unplug those O2 sensors tomorrow. DANG man I wish I would've watched this first. I thought it was a tranny problem with shifting.

[@ProjectDanH]

Hey! I'm glad I could help! God Bless 👍

[@deaddog3500]

@@ProjectDanH thanks for your help Dan, you've saved my Jeep from death. God bless your heart.👊

[@ProjectDanH]

@@deaddog3500 God bless you too!

[@nathanmccumber8965]

​@@ProjectDanHI got popping noise after I did my plugs I haven't done cap or rotor could that be my problem?

[@GamingByCalslaur4]

Literally happening to me started smiling when you mentioned it goes away and comes back. Gonna go unplug my 02 sensor see how it goes. Thank you

[@ProjectDanH]

My pleasure! God speed!

[@GlennBrown958]

Bro you're an absolute legend! Just pulled it out and she runs like a dream. Here's me thinking it was the cheap ignition cap

[@ProjectDanH]

Thanks brother! Spread the word! like share and subscribe!

[@danewallace9196]

I had this exact same problem in my 97 ZG. I was 1000km from home when it started using double the normal fuel consumption and running poorly. Dropped it into the Jeep service centre when I was near home. Left it there for 2 months and no-one could figure out the problem. The scanner didn't show up the error. It was destined for the junk pile but I took it home and after weeks of trying everything, I eventually unplugged the oxygen sensor and it instantly started running normally. Nice vid, too bad this all happened to me a few years ago when this info was not available!

[@ProjectDanH]

Hey Dane! Great story, sorry you had to learn the hard way. thank you for watching 💪

[@domprovo7863]

I know it’s a couple months old but your videos are some of the best. Kudos

[@ProjectDanH]

thank you so much! share the vids.. spread the word! 💪

[@jeronimo_bias]

Hi Dan! Thank you so much! You helped me to solve issue with my XJ after three week battle.

[@chrismcca]

Dan H I owe you my thanks, this finally pointed me to my problem on my 98 XJ. Oddly my CEL wouldn't come on when I unplugged the sensor but it behaved just like you said and ran ok when forced to run in "Open Loop" fuel mode. One extra thing to be sure - I put my code reader on and used the setting to watch live data and there is was, the o2 was drunk ordering drinks haha and spiking wildly out of expected voltages and messing up the fuel trim % values. So I watched this video twice maybe 3 times then had my own battle with it today and won in the end. Bosch o2 in and finalllly behaving after hot starts. Much love from Ireland and keep up the good work!

[@ProjectDanH]

Glad to hear you sorted that drunk sensor! I appreciate the views! 🍻

[@6.6shadow]

Dan you saved my wallet, been watching your vids for a while learning new things about my Cherokee and every time you make a video i learn something!!

[@ProjectDanH]

Right on buddy! I'm glad I can help. I love the Disturbed "the guy" icon

[@fixitwithzim]

Wow, thanks man! So I changed the transmission cooler lines on my 96 this past weekend. ( hard lines from the transmission all the way to the rad hoses). Not sure if you ever did that but it wasn’t fun. Anyway after I dropped the exhaust to put the new ones in, I noticed I had the same issue that you did in the beginning of your video along with a P0170 code. Turns out I must have messed up the o2 sensor working in that area. Fix one thing, break another. Sounds about right for me. Thanks for the helpful tips as always

[@ProjectDanH]

ain't that always the way!? two steps forward one step back. lol

[@FranktheTank83]

I put my faith in the “o2 socket wrench”.... i got the o2 sensor out as well as all the threads 🥴 ripped out the threads and had to tap new ones...thank goodness it worked. haha the box end wrench is the way to go all day! This was years ago. Glad you got her going again ✌️

[@ProjectDanH]

wow! that's scary stuff! lol. glad it worked out!

[@cravenadventures]

Man you couldn't have been more perfect on your timing of this video. Just got a call yesterday from That Jeep Girl that got that lift kit and she is having this very problem in her 98 ZJ

[@ProjectDanH]

Boom! The Lord works in mysterious ways. 🙏

[@cravenadventures]

@@ProjectDanH I told her to put seafoam in her fuel tank to clean her injectors and if it doesn't clean that up check her O2 sensors. And then you post your video and I sent it to her to watch. So cross our fingers everything works out for her. Because I am now 1700 miles away from her and can't help her but through the phone.

[@ProjectDanH]

@@cravenadventures cool buddy! Where do you put seafoam in Jeeps? Also what kinda seafoam?

[@cravenadventures]

@@ProjectDanH to clean the fuel system just add it to the fuel tank. You can put some in you oil to clean you crankshaft and under the pistons. And then some in you intake to clean all the carbon in the combustion chamber. Just make sure to run you jeep at 2-3k until all the smoke is gone. After wait at least 30 mins after putting it in. Longer if you never done it before. I have done it to all my cars and they all run clean and smooth

[@lorihouse1766]

@@cravenadventures someone told me to do that...it did nothing. No one has been able to figure out what is wrong. So many mechanics....so they say...they broke me by replacing everything else. I had to find Dan myself! I have put so much money into this thing and one video of Dan solved it..well think so I think. Haven't done it yet but the obd diagnostic tool said same thing. So gonna do it. And tell all those men to go in you tube and look up Dan next time you want to fix a jeep...or try to fix it. Hahaha!

[@bryanmenard9385]

Man thanks so much for this video. Had this changed in 15 minutes. This has been maddening for the last few months.

[@ProjectDanH]

Great to hear! Glad to help!!

[@MrJoey1570]

Hey Dan,you use a deep well socket,crows foot wrench or the box end you used or a pipe wrench if all else fails you use the tool to install the new one!!!!

[@ProjectDanH]

Yep, I realized that while installing the new one.. I said on film "oh i get it now... save that thing for installation"" 🤣🤣🤣 of coarse I edited it out

[@Longbow06]

Hey Dan, Great help for our 98 XJ that I was beginning to believe was possessed. This is the third O2 sensor, tried Bosch, NGK and Mopar. Think I need to check the ground. Well done with the "seat belt PSA"!

[@ProjectDanH]

Thanks Kevin! hope it works out for ya!!

[@marioortiz3064]

I’m on my second set of o2 sensors for my 98 xj which ones worked for you???

[@nathanmccumber8965]

​@@marioortiz3064what kind of sensor do you use now because I tried Bosch and now it's acting up.

[@EverydayOffRoad]

I had the same problem with the cheaply made 02 "wrench" I went and got the deepwell socket style now and man what a difference. Couldn't help but notice you have the "pre-cat" Y-pipe (CA/NY emission system) Take care not to damage that Y-pipe as there are none in existence any more and no aftermarket units exist. Had to use the "Federal Emissions" pipe (non-pre-cat) and had so many issues with BOTH the 02 sensors. Went through several different ones until we got the CEL to stop coming on. Go Grievous!

[@ProjectDanH]

Wow Dude, Thank for the head up on the Y pipe. I'll make sure to keep that baby in tip top. 👍

[@ryanfurman8944]

Hey Dan, I really like you're project videos. I am working a project 98 XJ of my own. I was wondering if I could replace my manual front seats with power heated seats and how would I go about that?

[@chriswarren2599]

Hi Dan, just letting you know changed the O2 sensor today. Needed a lot of heat, removed the front wheel for better access, used a long bar and it shifted. I also cut the old one down to get a six sided socket to fit. Had to use the old multi plug and solder it to the new wires but all good and running sweet from cold. Thanks for a great video.

[@ProjectDanH]

Great to hear! Thanks for watching!!

[@kavik526town2]

what were your symptoms ?

[@chriswarren2599]

@@kavik526town2 car would start, then after 20 seconds would begin to misfire, hold back and almost cut out. Carefully pressing the accelerator pedal you could rev the engine and it would clear. Then it would be fine until the next start up.

[@kavik526town2]

@@chriswarren2599 Sounds pretty similar it my problem. on accelerations and decelerations randomly it would lose power, RPMs would jump from 700 to 0 back and fourth and popping from intake then have 15 seconds would go back to normal.

[@nathanmccumber8965]

​@@kavik526town2how u fix popping.

[@zigster62]

Once again Project Dan H keeps a older Jeep on the road and out of the scrap yard 👍🏻

[@ProjectDanH]

Thank You!!!

[@austincalvert8323]

Dude I have a 99 tj doing exactly this, I’m so glad I seen this video. Thank you bro!

[@ProjectDanH]

Glad I could help!

[@jfish931]

Bro I replaced everything on here thank you so much it was the o2!!!🙏🏻🙏🏻

[@ProjectDanH]

Glad it helped, God Bless

[@hayzersolar]

well got the o2 put in on Wednesday and no issues. the hesitation is gone runs better feels like more power, but we know that's not true. thanks for the video now im going to make a video of my 96 my channel is called project xj

[@ProjectDanH]

Excellent Marc! Can't wait to see it!

[@johnweber4169]

When that Oxygen Sensor wrench broke I was like bring out the heat! That wrench wasn't built for the power of Dan.

[@ProjectDanH]

🤣🤣🤣 💪 Strong AF!

[@lexinme]

😮 omg this is totally what’s happening to our 99 Sahara. Love the video and how in detail it is, thank you 😊

[@ProjectDanH]

Glad it was helpful!

[@lexinme]

Ok we finally got the upstream sensor replaced. We had left it unplugged a few days and once the new was installed next day it was running the say way. Rough idle at the start, doesn’t die but still idles rough.. we didn’t unhook the battery, does it need reset ?

[@jaysmith5084]

I just cut the wires off put my impact socket on it and spin it out 😂 I use the O2 sensor socket to reinstall the new one if it's a tight space an old pipe wrench works too . My old ZJ would run better with the O2 unplugged and it get better milage but I replaced the O2 sensor because of inspection was due . Great video DanH and a little heat goes a long way 👌

[@ProjectDanH]

Thanks Jay, I love the impact gun trick! great idea!!!

[@jaysmith5084]

@@ProjectDanH saves time especially on Subaru's since everyone in my family like to buy them 😂 I tried to bring them to the Jeep side but they like AWD and gas mileage 😔

[@ProjectDanH]

@@jaysmith5084 Gas milage... Sad 🤣

[@kmet2000]

Hi, I have been banging my had on fine starting poor running 91 XJ. Pulled out gas tank, done ultrasonics to injectors twice, flushed the fuel lines, measured fuel pressure, new ignition cap an cables, coil etc... Nothing bad since it is 15 years sitting barn find. Now - this is to be tried next! Thanks!

[@ProjectDanH]

hope this does the trick!

[@kmet2000]

@@ProjectDanH Hi, it sure did the trick! Runs like a champ now! kzbin.info/www/bejne/fIiypKOIadyMhrc Thanks for great info!

[@stephenreill2258]

Dude. This video saved me a lot of time and money on my Ram. Thanks brother!!!

[@ProjectDanH]

Glad to hear it!!

[@TheBeardedJeeper]

O2 sensors are a pain. Great video man

[@ProjectDanH]

Yup! Thanks Bro, Congrats on 5k!

[@skajlet9045]

Watched dozen of videos related to O2 sensor and this is the first one showing this method to test O2 sensor :O

[@e.gadd.1]

It costs about $110 to replace the upstream and downstream O2 sensors, and they're welded in so I have no idea how hard that is going to be. But I can't for the life of me anywhere, find someone who can tell me how to determine if this is a waste of money or not. I suspect it is.... it seems my Jeep is dying no matter what I do

[@rick850angler6]

U just saved my life bro my girls Miata is doing this ive spent so much I didn’t know this till now...lol I bet this is it nice vid man...

[@ProjectDanH]

Glad I could help brother! hope you solve the issue!!

[@markhunter9496]

Hi Dan, I know I am very late to the party but you legend, you are the only one I have found to explain this with a good demonstration, keep up the good work, another Aussie happy to sub to your channel.

[@OLIVER_313-CFG]

Gracias por explicar lo voy a probar en mi Jeep wj 4.0 para ver si se arregla la falla que si acelero a fondo el motor se confunde y no sabe que hacer

[@chriswarren2599]

Such lovely cars. Better than the newer stuff.

[@ProjectDanH]

Amen!

[@MajorWeakness]

Dan you're the only one that I would know who would know this. I ripped my downstream o two sensor out of my two thousand x j and it seems to have a three wire sensor I need to know which color wires go to which color wires

[@johncarr4427]

Awsome vid. I have an 07 that is giving me the exact same problems that your vehicle was giving you. Changed plugs, no help. Changed coils, no help. Gonna try the O2 sensor next. But it looks as though getting to it is a bit harder than yours. Thanks.

[@JoeVizethum]

nice video - heat and a 6 pt wrench always are your friends ! May be anti seize is helpful before hooking up the new O2 sensor.

[@ProjectDanH]

heck yea buddy! it came with the copper anti seize pre installed! 👍

[@DEInTheGarage]

Your O2 sensor and I have the same issues when I get near those silly sodas...

[@ProjectDanH]

lol!!! we need a silly soda live steam!!!

[@scott2143]

Awesome. you are only guy with my symptoms. Just unplugged, but no real runnjng time yet.But, you are spot on with fuel consumption. I lost over 1 mile per gallon when I noticed it.

[@ProjectDanH]

Yep, tell tale sign! Thanks for watching. hope it helps, God bless!

[@scott2143]

@@ProjectDanH 2 days and doing fine.

[@robertgrauman8602]

You're lucky. I've snapped the bung off before. Now I price compare and plan on replacing exhaust parts.

[@ProjectDanH]

OH MAN!!! That sucks!!! Welding a bung hole is the last thing I want to do!

[@robertgrauman8602]

@@ProjectDanH first, the images that come to mind when you say "welding a bung hole" are hilarious. Second, the things I would have fixed over the years if I knew how to weld.

[@ProjectDanH]

@@robertgrauman8602 🤣🤣🤣

[@deepclean5335]

Good video. My Astro van has multiple misfire I changed spark plugs and wires and distributor cap and roto. Scanner show now the oxygen sensor

[@ProjectDanH]

exellent, fresh parts will make er sing!

[@MrOliverAC]

Same story as in your video. So I went ahead and order a new O2 sensor Upstream. Replaced it and now I haven't even worse misfire. Maybe I damaged the O2 sensor during installation or maybe I just got a cheap brand from Amazon

[@ProjectDanH]

Gotta make sure you get the corect 02 sensors.. double check with your autopart store

[@marvicty]

Dan, your not suppose to touch the part of the O2 sensor that is inside the exhaust. Your were fingering the snot out of it when you popped the plastic cover off of it.

[@ProjectDanH]

LOL! True!!! if it goes bad ill replace it and exercise a little more caution.

[@WJ_Warpig2024]

Great video. This is exactly the problem on JGC

[@ProjectDanH]

Thanks for watching!

[@francisbrackney2061]

There is a double ended 14mm/18mm thread chase/ cleaning tap that works great for 02 sensor and spark plug threads to clean out the carbon and rust. Check it out..

[@ProjectDanH]

Thanks for the info! will do!

[@danhambrick6331]

Nice job Dano.I just replaced all 4 of my O2 sensors.I had to use the torch and PB Blaster.I bought that same offset O2 wrench at HF and it worked just fine for me.You must have got a bad one or it was just your brute strength...lol...Take care brother.....

[@ProjectDanH]

lol.. ill chalk it up to brute strength 🤣🤣💪💪

[@deborahcampbell9602]

Omg! Theres 4!!!! Damit no grrr I have an 01 and nothing but problems and empty pockets trying to fix all these issues (rd. Side) myself before snow hits ny. (meantime im walking everywhere ) so reading you changed 4 ! Tell me you ment to say on 4 seperate jeeps plz Lol

[@nathanmccumber8965]

​@@deborahcampbell9602are you in Midwest I'll buy it off you.

[@joshpasstheaxe]

Noticed your rear main seal was leaking, I put that off forever on my TJ. Finally changed it over last winter... it now leaks worse than it ever has this summer lol some things are best not repaired

[@ProjectDanH]

LMAO, Its nice to have a leak free Jeep... difficult to achieve tho

[@MrCarltonv]

Thanks. My 1997 is having exactly that problem. Had no clue.

[@ProjectDanH]

you got it brother!

[@mikez9799]

You the freakin man, Dan! Keep the ZJ alive!

[@ProjectDanH]

You know it Mike!

[@kevinschneider5268]

Hi Dan, I have a suggestion. Your videos have helped me with EVERY project I’ve undertaken so far (right down to re-soldering the driver-side master window switch!)with my ‘97 ZJ.....with one exception. Fueling my ZJ is a real chore due to the fact the pump nozzle shuts off every ten seconds. It might go a little longer if I adjust the angle, pull up or down, or back it out a little. After watching a few KZbin vids it’s apparent there’s an obstruction somewhere but I won’t attempt tracking it down until I’ve seen you do it! Thanks! KS

[@ProjectDanH]

Hey Kevin! Thank you so much for all your positive feedback! I'll look into it and I'll see if I can find a solution! Thanks for the suggestion!

[@ryang5441]

That’s a blocked vent or Evap issue in the gas tank

[@alangrant5278]

Check the charcoal unit. When you fill the tank the air displaced by the fuel vents through the charcoal unit (to absorb hydrocarbons in that air). On another off-roader the air vent from the charcoal unit was dangling down and got full of mud, so air couldn’t flow out and hence petrol pump shut off very quickly. We cleaned out the charcoal unit and vent tube and back to normal. Also rerouted that tube to be less likely to get submerged 😊

[@josephjoestar3275]

My 97 Cherokee has been having a Cyl 1 misfire that does it with no rhyme or reason, randomly in all sorts of different conditions...I should give this a shot.

[@projectbumblejeep4190]

Hey Dan! Yeah, I purchased the socket version of the O2 tool years ago. I found out the same as you, on the old sensor, cut the wire and use a tool that grips on the hex. You can use the tool to install the new sensor. So no luck on the power steering pump bracket? Thanks for looking any way. Guess I'll have to take the time for a yard trip. Should have done that in the first place. Does this problem also happen with pre OBDII Jeeps as well? (Bumble Jeep is a 95) She runs good now, but fuel economy is awful (10ish). God bless, stay well.

[@ProjectDanH]

Sorry brother, I thought you were gonna try your luck at the you pull first then use me as a last resort. Im sure i have one somewhere I have just been crazy busy

[@projectbumblejeep4190]

@@ProjectDanH No worries man. I really need to take a day off and just go. We have a pick and pull about 30-40 mins. from me.

[@bikesqump]

I'm tryin this next! I just swapped the TPS, slight improvement but still bump'n jump'n.

[@ProjectDanH]

LOL, hopefully this does the trick!!

[@DEInTheGarage]

I have had the same issue with ever O2 sensor socket I have ever bought... Chinesium!

[@ProjectDanH]

Chinesium is weak AF!!

[@vaman86]

I went for a genuine Jeep part here... but who knows... prolly " Fait on Chine" like all the rest

[@CoinHuntingDrew]

I've got the same issue except I'm pulling a P0171. Replaced IAC, vacuum valve, vacuum hoses, MAP, etc.

[@ProjectDanH]

oh man.. is everything working now?

[@CoinHuntingDrew]

@@ProjectDanH nope, haven't replaced o2's. Do we think it's an O2 issue with a P0171?

[@ProjectDanH]

Possibly... I didn't have a code when I change my sensors.. hey, it couldn't hurt to put new ones in anyway

[@finwashere583]

I'm having exact same issues. Only codes popping up. But I unplugged it and the check engine light never went off 🤣 I'm replacing it in a few days here.

[@ProjectDanH]

ZJ o2 sensors should only have a code with the o2 sensor unplugged.. good luck!

[@Furlong157]

Will putting a new one in help with gas mileage? I did a full tune up and fuel pump and filter. And get 10.5 mpg all stock wheels and tires

[@ProjectDanH]

Yes it will

[@palomarknotsandtatertots523]

Having similar issues with an 01 and this answered my questions. Thanks for the video. Liked and subbed.

[@ProjectDanH]

Awesome, thank you! Glad to help

[@mikegriego3671]

Yup. Open loop while it's not using the o2 sensors, runs just fine. Once its gets warm enough to go closed loop, runs like shit. Change those o2 sensors.

[@ProjectDanH]

Bingo!

[@joehyundaitech7961]

heat can be your best friend nice job Dan

[@EddieBarksdale]

Having this problem on my 5.2, engine would just lose all power trying to accelerate and nearly stall coming to a dead stop. I love the irony of how the temporary fix is to just unplug the sensor so it has to use the OEM default levels which were already optimal 🙄

[@mattgotsskill]

but apparently that makes your engine run VERY rich and your mpg will drop to like 10mpg

[@ProjectDanH]

Very ironic! but still neither the best performance nor efficiency... and you wont pass inspection. lol

[@tmmyjay]

Cool video. My XJ has a P0155 code and won't start. I disco'd the PCV from the manifold and it started right up. Any idea why?

[@JBWorkshop90]

This is exactly what my zj is doing, going to try this. Thanks for the info.

[@ProjectDanH]

No problem 👍hope you can fix it!

[@JBWorkshop90]

@@ProjectDanH Yep it fixed the chugging issue! Still smells like it's running a little rich but I'll take it lol

[@randomactsofdave7435]

Looks like Grievous possibly has a rear main seal leak. I noticed the oil drips when you fired em up to heat up the sensor. I have the same drips on my YJ. I'm not worried about my drips as I don't get any on the ground. No evidence, no problem👌

[@ProjectDanH]

Yep! Rear main and a trans output seal or Transfer case input seal (probly Both!!!!!) unfortunately theres pleanty of evidence.... my driveway is shot!

[@randomactsofdave7435]

@@ProjectDanH well it's an aging Jeep so it's probably both and something else. It's a labour of love! Cheers!

[@ProjectDanH]

@@randomactsofdave7435 YUP!! Thanks Brother 🍻

[@curtiscarnes2245]

I believe your making these videos just for me lol. Thanks for the great tips

[@ProjectDanH]

HAHA, All Jeepers experience the same crap! have one issue... have em all 🤣

[@curtiscarnes2245]

@@ProjectDanH I just picked up 2 more 1998 grand Cherokees for parts. 3 Jeep’s make one good one lol

[@ProjectDanH]

@@curtiscarnes2245 I know that game!🤣🤣🤣!

[@billspud2975]

Hey I've been struggling with this problem for months thanks

[@PeterPAAntony]

Great video and helpful. I have an 1999 4.0 XJ.

[@ProjectDanH]

Glad it helped

[@subgrindz]

Just started having this exact issue in my 99 XJ after replacing my front pipe over the weekend. It was running slightly rough the week before but no misfires, just a slight power loss on the highway and a low rpm drop coming to a complete stop. After the front pipe replacement it was much worse and running the same yours and smelled severely like gas. Unplugged the upstream o2 sensor this morning and all the problems went away, no misfires, but the strong gas smell changed to a rotten egg smell with a hint of gas, do you think I have another problem?

[@dustincrouch7926]

Well I'll be dinged. Unpluged o2 and it stopped thank you it has been bugging me for 6 months. Thank you.

[@ProjectDanH]

haha. crazy right??

[@rollcam321]

Watching with my 98 wrangler now. Just unplugged it and now I’m going to drive it around to see if there’s any change.

[@ProjectDanH]

hope this does the trick!

[@rollcam321]

@@ProjectDanH worked perfect and I got it muddy. Priceless 🙌🏾🙌🏾🙌🏾 Thank you

[@Deadbuck73]

Hey Brother Dan! I’ve twice now gotten the code for my lower o2 sensor. The first time it went away… this time it’s been on for days… so today I decided to go punch it in the face and see if I could loosen it up… got the bung hole glowing with my torch… tried to get on it with a big plumbers wrench… wouldn’t budge… so I made sure the wires were ok… looked like wires… drove to Walmart… 2 miles… and when I got in to come back it was off! So yeah… I figured I would have killed it dead with the heating… but now it’s happy again… propane to the face for the win!

[@ProjectDanH]

Heck yeah! you burnt off the bad!!!

[@dsnysanman826]

What’s up Dan !! we Met back in 2019 my 2DOOR red Cherokee turns on fine then shuts off like in 15 seconds I turn it back on and it’s fine change the 02 sensor map sensor crank sensor the coil still doing the same thing need your help number one jeep person I watched

[@dsnysanman826]

So, Dan what else can cause my jeep to shut off every-time I go to start it when I go to work sits for 8 hrs when I come home from work same thing cold start fine for a few seconds then shuts down start again then it fine?

[@wvjeepdude9739]

Mines has a miss I've replaced everything but the O2 sensors but my exhaust has holes all in it so im waiting to replace them because I'm gonna replace maifold back.

[@ProjectDanH]

There ya go dude, that's smart execution!

[@garyfarist2240]

I would advise wd 40 dont ever use a torch burner especially with fuel, and your hot on. I got mine off by tapping the wrench and w40 Let it sit

[@ProjectDanH]

Good tip! Thanks for!

[@shootmovecommunicate3322]

Bro. I've been trying everything. I'll try this out next.

[@ProjectDanH]

hope it does the trick!

[@shootmovecommunicate3322]

@@ProjectDanH pulled the upstream sensor and THAT FIXED IT. you da man.

[@bradpittiful7288]

breakfast video with dan h...awesome...my breakfast consisted of potato chips! yum!

[@ProjectDanH]

haha! Nice!!!

[@joelhaizprua]

Going to do that tomorrow. Mine is a 98 grand cherokee laredo, 4.0 / 2wd. God bless you for your eagerness and love for these machines. I've owned mine for 14 years, it has 147k. I've put 42k in these 14 years. I'd like to show you the headlights upgrading I'm doing to it, installing the round led 7 inches diameter ones. Looks like an hybrid front. Btw, how did you hook up those black towing hooks under the bumper?

[@ProjectDanH]

Thanks for the support brother! They are factory ZJ hooks, I have a video on it not too long ago. Give it a view!

[@raymondthompson4619]

Had the whole car moving trying to get that 02 sensor off 😂. Great video! Looking into get a Jeep Cherokee any suggestion on best place to buy one? I live in southern Utah(2hours from Las Vegas). Thank man!!

[@ProjectDanH]

Thanks manI Yea, I had to crank on that suckers harder than any other O2 sensor Ive pulled. I would get a Rust free XJ from the desert! nowhere near salt water oceans or wintery salt roads

[@marioharris4015]

Great video my unk having the same problem and I love the here we go again instrumental

[@ProjectDanH]

Glad you enjoyed it

[@chriswarren2599]

Great video, about to do this on my 1997 ZJ Orvis here in the UK.

[@ProjectDanH]

Awesome man, Best of luck

[@kevinschneider5268]

Hi Dan, my 97 ZJ (198,000) had the same issues as Grievous also with no codes thrown. I unplugged the o2 sensor and it ran great for about 5 miles before it was back to the bucking and sputtering. I haven’t plugged it back in and am surprised it didn’t go to default mode which makes me wonder if the o2 is the problem. The codes note the o2 sensor gone and an engine misfire. I’ve done everything suggested in the various KZbin vids including throttle body clean, new IAC and TPS. I also changed the dist cap and rotor. Before I go off half-cocked and buy new injectors, wires, plugs, cam/crank sensors, could you maybe narrow it down? Gosh I hope you still read these threads!!

[@ProjectDanH]

Hey Kevin! These Gremlins can be extremely annoying. I'm glad you cleaned your TB, that's very important. Sometimes your Jeep can run bad simply because of a loose ground. I'd start with testing the battery, sometimes you can get a dud off the shelf. Make sure all your connections are tight and clean. Also check your wiring for cracks, breaks, and loose connections. I would definitely recommend a set of plugs and wires, they're not too costly and it wouldn't hurt to replace. Sometimes ya just gotta work through the process of elimination. God Speed brother

[@chillsmasher7379]

I had really bad idling issues with my 97 grand Cherokee and ended up having the crank sensor replaced and it did wonders. Now the only thing is that it has a really rough idle when the engine is cold but doesn’t have any issues at all once it gets to normal operating temps. Going to replace the upstream o2 sensor tomorrow. Hopefully this should fix the cold rough idle issue!!

[@nathanmccumber8965]

​@@chillsmasher7379what sensor were cracked.

[@Ricksymon]

Would this also work on a 2000 grand Cherokee Laredo to 4.0?

[@ProjectDanH]

Yes, it should.. New 02 sensors never hurt

[@MajorWeakness]

Great Info! I hope they gave you your money back on that socket!

[@ProjectDanH]

yep!

[@kevinferrari5525]

Project Dan,you da man!

[@ProjectDanH]

Thank Kevin!

[@bencegal3511]

Hi Dan, your videos help me a lot, i found this video, my problem is in my 5.2ZJ absolute no power, if i go with max gas, my car put from 1 to 2,3,4 max 3500 / min. Same problem like this video?

[@ProjectDanH]

Hmm.. I'm not sure about the 5.2 .. never had one

[@travispoulin252]

Replace your TPS (throttle position sensor)

[@MowerJunkie]

I had this problem with My XJ 2.5 4 cylinder. a new O2 sensor also fixed My misfire.

[@ProjectDanH]

amazing how these little things can cause so many issues when they go wrong.

[@Marko007ify]

Mine is '94 5.2, wondering whether it might be the sam problem im experiencing

[@magcv92]

Hey Dan, quick question, did your MPG improve after plugging the new sensors? (I mean new/good sensors vs. fixed/open loop operation/unplugged sensor)

[@seantbr2019]

I got a 96 all the same symptoms that your saying I have a cel random multiple misfire p0300 but it only runs rough at idle but runs like a champ down the freeway

[@ProjectDanH]

hope this helps!

[@seantbr2019]

@@ProjectDanH it was the iac

[@SvoBrianRobles]

What is my XJ is already straight pipe and has not Cat, the o2 sensor plug is just hanging off ?

[@laostuh860]

hello Dan, love your video on this. I'm going through the same issue, I unplugged my o2 sensor and it still runs like crap, would it be my ecu? Replaced intake manifold gasket, gaskets for port fuel injectors top and bottom, fuel pump and fuel filter, mass air flow sensor, pcv valve, spark plugs & ignition coils. Car used to run okay,, Car is not been running well, it sometimes feels like its about to stalls out in idle and drops to 500rpm and engine shakes.

[@ProjectDanH]

silly question... have you scrubbed your throttle body? when's the last time you replaced you're battery?

[@joehyundaitech7961]

dan the video quality is amazing what are you using ?

[@christophergarcia2397]

I changed my two 02 up stream and downstream sensors on my 05 jeep liberty and on the code reader it still comes up as bad catalytic oxygen sensors bad. I need the check engine light off in order to pass smog. Stressed tf out😒 Need help ASAP!!

[@ProjectDanH]

Have you checked your cat?? You may need a new one

[@christophergarcia2397]

@@ProjectDanH Had the mecanic check it out and he said that 2 sensors are missing. The code is po158 which is bank 2 sensor 2. I really hope it’s the catalytic converter.

[@whoispradeep]

It would be bank 1 upstream o2 sensor or bank 2 ? How would I know,pls?!! Can I drive with o2 sensor disconnected for testing reason?

[@ProjectDanH]

Change em all!

[@OverlandingJoy]

I'm getting a pO161 on my 2001 XJ and think it may be the downstream O2 sensor. ??

[@ProjectDanH]

wouldn't hurt to replace it

[@kavik526town2]

I have the same issue, on accelerations and decelerations randomly it would lose power, RPMs would jump from 700 to 0 back and fourth and popping from intake then have 15 seconds would go back to normal. Same kinda symptoms you had? Also I don’t have any codes.

[@ProjectDanH]

Probably The 02 sensor!

[@kavik526town2]

@@ProjectDanH Changed the O2 sensor & it seemed to make it worse. I think it helped me exposed a problem since I finally got a code lol. P0171 System too lean (bank 1)