Kia and Hyundai 3.5 oil leak diagnosis and repair

Before starting this repair please note: DO NOT over tighten the sensor. Over tightening the sensor will lead to cracking the housing.
Today I talk about a common oil leak on Kias and Hyundais with the 3.5 liter v6. This Leak can be hard to find and is commonly misdiagnosed as a rear main seal. I go over how to find the leak source and perform a step by step guide to repairing the leak.
Thank you for watching! Please like and subscribe. Feel free to ask any questions in the comments section. I try my best to respond to every one of them.
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[@InTheShop]

DO NOT over tighten the sensor. The threads are a tapered pipe thread and over tightening will lead to damage of the housing the sensor is threaded into.

[@lazysplit]

Seen to late broke housing😢

[@samroberts7165]

Anybody ever replaced the piece the oil pressure switch screws into?

[@samroberts7165]

Part# 21160-3C700

[@samroberts7165]

I have one that has been fixed with JB weld. Not sure how that piece comes off.

[@JoiceVaderd]

​@@samroberts7165I'm currently doing that. The housing is called the "Oil Cover". You have to drain the coolant, remove the coolant assembly, on the driver's side of the engine, remove the the center coolant pipe and then you'll have access to it. You'll need to replace the oil cover gasket, the two o rings on the center pipe, and the gaskets on the coolant assembly. I recommend adding a little RTV to the oil cover gasket, the seal it better. I torqued everything to spec and still had it leaking a tiny bit of oil. Have been doing this job since Monday afternoon. It is currently Thursday morning. I just want it done.

[@rafaelmarin1963]

Man, like an open heart surgery to remove a blood clot. Seriously though, you are a top notch mechanic. Much respect.

[@InTheShop]

Some of these jobs are very tedious for such a minor issue.

[@cathytutty3635]

Excellent work thanks.

[@orangekid2175]

Thank you very much, Kia Sorento v6, 3.5. dealership found a oil leak, quoted me a rear main seal, valve cover, oil pan gasket and timing belt cover. $1700 but couldn’t tell me specifically which gasket was the fail point. A little Google and KZbin tells me it’s a few gaskets and once sensor. Save me a Ton of money and anxiety.

[@michaelteal4942]

I followed your video, replacing oil sensor on my 2013...you saved me so much money..THANK YOU...YOUR AN AWESOME MECHANIC

[@ramstar27]

All I can say is wow! You have got to be one of the most thorough mechanics I’ve seen on KZbin. I just liked the video and subscribed. Keep up the most excellent work! And thank you so much for making this video! I have a 2011 Kia Sorrento SX that needs a pressure switch and I’m pretty mechanically inclined, but I’m not certified. This is a huge help and saves hundreds.

[@Latincouple1234]

keep the good work my friend. you are the first young mechanic that actually knows his gig. all explained to perfection.

[@InTheShop]

Thank you Esteban!

[@bub020]

Spent the last few days between a few shops trying to figure out where my major oil leak in this exact area was coming from so thanks for putting this video up tremendous help!

[@InTheShop]

Awesome! Glad I could help.

[@lupm7537]

Thank you very much, I just got quoted for the same issue by a shop 1200 $ to replace transmission / engine seal and watching your video make so much sense , thanks a lot again. I will buy the sensor and replace it myself.

[@Ritemon]

Thank you for your in depth coverage here. I own a 2017 Santa Fe that has an oil leak. Not much is leaking but, it's enough to look into getting it repaired. I took it to my local mechanic who generally has done good work for me on multiple vehicles over the years. They definitely misdiagnosed my leak as the main rear seal. $900 later, I still have a leak! Taking it back tomorrow armed with information from your video.

[@98latch]

Thank you so much. I just finished repairing my 2012 Sorento oil sensor leak. Being able to walk through this in advance and know what sizes of socket I needed was worth a lot to me.

[@amjadzidaoi4011]

All the symptoms you've mentioned in this video are right there in my 2008 hyundai sonata v6. You saved me from replacing the rear main seal coz I thought it was shot. Thanks a million to you sir.

[@InTheShop]

Thanks for watching! Hopefully this helps you.

[@rickgodwin3010]

Just finished this sensor replacement, your video was perfect, you saved me a lot of grief, appreciate your time, Thank You

[@InTheShop]

Awesome! Glad I could help!

[@bobkampmann337]

Thank you! This video has not only educated me for the future but finally got me to stop chasing my tail around in circles trying to find this crazy oil leak that appears to be a rear main seal. Thanks again for saving me!

[@InTheShop]

Glad I could help!

[@Wings3388]

Excellent job. I wasted some money to those people to replace the gasket... still didn't get the problem fixed. Finally, I followed your video step by step to fix it myself. Thanks very much!!!

[@brad-tammykitten3699]

We just purchased a 2015 Kia with an oil leak. Taking it back to the dealership tomorrow, but I assume they are not going to fix the issue. After watching this video I am certain that the oil leak is caused by the oil sensor just like the video. Thank you so much for such a detailed video. If I have to perform the repair this video is going to come in very handy. Thank you so much "In the shop".

[@TimHootenJr]

Amazing video, this helped me diagnose the problem and I'm confident now that I can do the repair my self. Also thank you for showing the sensor up close to the camera, some of these smaller parts are so hard to match for sure without things like that.

[@AndyDeMontana]

My 2012 Sedona's failed 700 miles from home. I limped it back at 55 most of the way, adding 2 quarts of oil every 20 miles. That was a LONG, EXPENSIVE drive home. Thanks for posting this - the fix looks time-consuming but very do-able.

[@JohnBrodeur]

Well done! Miss having your shop around, always honest and trustworthy. Peace!

[@crishnamcgivney563]

I'm hopeful this is what's wrong with the santa fe.. taking it for a 2nd opinion Monday here's hopping... Thxs

[@rph247]

Thank you for posting, even though I was working with the 3.8 L lambda (2011 Veracruz Limited) oil cooler removal and knock sensors replacement. It helped me avoid a potentially huge 🔥 issue with the gas rails. Went and rewatched multiple times!

[@ElVic82]

Thanks for taking the time to make the videos that you make.

[@emmajanas1552]

I want tom thank you so much for all then insight on replacing the oil pressure switch. I also thought it was a main seal until I found your video..Your insight was spot on and your video was clear and easy to follow along..Thanks again

[@dionisiocueva3689]

Awesome, you explained loud and clear. Thanks

[@grandenauto3214]

One of the best examples of a how-to video I've seen. Thanks.

[@InTheShop]

Glad you enjoyed it! Thank you.

[@ourkid2000]

Amazing. Doing this tomorrow and using this guide, fantastic detail!

[@dvjergensen]

Great video thought my block was cracked and found this video and had it fixed in no time!

[@BenjaminTedmondson]

I’m really happy this popped up in my google search! The leak definitely looked like a rear main to me, and it started at a few drops and went to a whole lot in less than a week. Thanks for the video!

[@BenjaminTedmondson]

I should amend my comment. My leak had all the symptoms of this one, and was even leaking from exactly the same location, but mine turned out to be a head gasket. I stopped counting after 4 stripped head boot threads in the block. Threaded inserts are holding strong so far!

[@donnameagher2131]

My 2015 Santa Fe exhibiting same problem. 😮 Taking it to Hyundai dealer tomorrow for repair and prepared to pay big $$$$. 😢 Wish you were close to help me!! You did an awesome job! Kudos!

[@arthurspontiacfieroblog]

Your video was instrumental in getting my '11 Sedona back on the road. Many, many thanks!

[@InTheShop]

Glad it helped! Thank you Arthur.

[@kencover6949]

This video was a lifesaver for me. Thank you so very much!

[@robertgelley6454]

Excellent video. Awesome instruction. I may have to be doing this for my friend's wifes car. Your instruction makes this possible to do!

[@jefffisher5706]

Just had this happen this week on my 2011 Sedona. Wouldn’t have been able to do it without your video. Thank you very much . Shop wanted 800$

[@InTheShop]

Glad it helped! Thanks for watching.

[@nickderen7660]

Great video. Described my exact issue and the procedure was bang on. Thanks👍

[@Cmhhh9]

Thank you so much you saved my life know i see what was leaking this whole time

[@MrCodyswanson]

Great video, I've had to do this twice on our 2012 santa fe, the first time it happened I thought for sure we had a major engine failure. The first time I replaced the oil pressure sensor I used an OEM part from the dealer and it failed about 12 months after it was replaced and leaked oil again. The second time I purchased one from the local autoparts store and it's been holding for 2+ years. I've had luck sneaking a deep socket in under the coolant crossover tube with a long wobble extension to get the old sensor out. Saves a lot of time messing with box wrenches. Also, I would recommend anyone looking to diagnose this to invest in one of those small USB inspection cameras or boroscopes from amazon. Mine cost me $25 and has saved my butt more than once looking at hard to reach places like under the plenum (it's how I discovered my original sensor was leaking).

[@InTheShop]

Thanks for watching! I wish the OEM would update the part but they just keep making the same faulty sensor.

[@bmeach4940]

58k on our 2019 Sedona and noticed a stream of oil under the vehicle at startup - after topping off with a full quart of oil. Thank you for this video my friend!

[@rogerrudd7679]

Best video i seen on this yet.

[@Building_the_SHACK]

Couldn't believe my luck when I found this video. My 2010 Santa Fe 3.5 with 326,000km threw the oil light on my way home from work. Pulled over and checked under the front end. Oil was running out the bottom of engine where it joins the tranny. Was sure it was the crank seal. That was until i saw this video and confirmed it was the oil sensor. Yippee !!! Still a tough repair but far easier than fixing a rear crank seal. Thanks a bunch! This was an easy-ish DIY fix with $150 in parts verses a full engine pull and likely well over $1000 in labour if it was a crank seal failure. Book hours for the sensor is 3 hrs crank seal 11 hrs 3 things I found helpful from my experience. Box end wrench on the sensor also did not work for me. The wrench body was too wide to get any swing. I used a socket which I slide in under the fuel rail. You could also grind out a section of the box end wrench where it interferes with the head to allow for more swing. Secondly the 6mm allen bolts to detach the lower plenum are quite deep. You'll need at least a 3" long key head to get down between the fuel rail and the ports to get to the bolts ( you can also loosen the fuel rails to get an extra millimeter or two of clearance if you have a shorter wrench and need to get the wrench head down farther). I also had to cut the sensor wire from the remoter starter to allow the upper plenum to e moved out of the way.

[@reggers88]

Just wanted to thank you so much for your detailed video on replacing this sensor. You can tell with your presentation you know your stuff. Much appreciated and I have subscribed to your channel.

[@InTheShop]

Thank you! Glad I could help.

[@reggers88]

@@InTheShop I had taken it by two shops and they both had me quoted on replacing the main seal , one of them at the cost of $2800. Thankfully, I boyfriend decided to investigate and came across your video and you proved him right!

[@thutch9502]

The video made the job go flawless. Thank you!!

[@InTheShop]

Awesome! Glad I could help!

[@ronaldlogan5311]

Nice job now I know to take this to my mechanic. There was a time when I would tackle the job but those days are gone. Thank you.

[@InTheShop]

Glad to help

[@jackbowden8866]

Great video. Was going to take our Santa Fe to a mechanic, but after watching your video, I am confident that I can change the sensor myself. Saved me a bunch of money. Thank-you, and keep up the good work.

[@InTheShop]

Did you get the sensor changed?

[@jackbowden8866]

@@InTheShop Yes, I did, and it all went smoothly. Had to grind a big notch in my 15/16' wrench to get enough movement to go to the next position.

[@marczito7176]

This video was very helpful. Replaced my oil sensor and PVC valve in a few hours of time. Sadly, the oil sensor isn't the source of my oil leaking, so back to the drawing board.

[@619elm]

I'm sure glad I watched the whole video. Quite a few things I wouldn't have expected, like coolant from the throttle body leaking and how tedious removing the oil pressure sensor will be. Good job thanks for the video!

[@InTheShop]

Glad you enjoyed it! Hopefully it helped you.

[@edwinjewell5359]

Man your one Great mechanic dude. 👍

[@ScreamingHermit]

So I'm here because I'm shopping for a used SUV. Looked at 3 vehicles today with this engine, 2 Santa Fe's and 1 Sorento. ALL THREE of them had this leak! The oil was dripping off of the end of the transmission bellhousing, and to my uninformed eyes, it sure looked like a rear main seal to me. Now I know better. Great video...thanks!

[@InTheShop]

Thanks for watching. Glad I could help!

[@bryanlyle]

Nice video! The fact that you have to disassemble the entire engine to get to a part that will most certainly fail on 90% of vehicles seems almost criminal by Kia!

[@steveauston6020]

Thanks for the info. Well done!

[@abc-ku8ql]

Thank you for the video and just keep the honest videos coming.

[@InTheShop]

Thank you!

[@David7pm]

Thank you for this awesome video. I have a 2011 Kia Sorento with 79K but the 2.4L (4 cylinder) . It just started to leak some oil. Kia dealership said the timing belt cover/casket needs to be replaced for $1900, but at the same time, they seem like they didn't want the work. I thanked them and left. So, I will look at the top of the engine as you described. Again, thank you. Take care.

[@shane250]

Your engine is not V-shaped, it's an inline 4 cylinder. Your oil pressure sensor is at a completely different location.

[@risingperspectivesmedia3426]

Life saver. Great instructions

[@kriscocquyt9229]

What to say great video too have the same problem video made the job easy and save a guy money. Great work. I’ve been doing auto glass for 18 years now need to make videos to help people thanks again

[@Toyotaelectrotech]

This is a very good video. Thanks for taking the time to do it.

[@InTheShop]

No problem! Glad you liked it.

[@adamfrederickson1226]

Thank you, this was great information

[@ryanvanriper5431]

Awesome video! Thank you for saving me a tow money and shop costs!

[@jean-pierrehabash9798]

Great video !! This helped do the job the whole way. Méthanier again sir !!

[@AndyDeMontana]

I used this today on my 2012 Sedona. Took me 11 hours and three trips to the hardware store, but I got it done. You did an excellent job explaining it, you have a great presence, and know your stuff. Thank you. Keep up the good work.

[@hugh3rdof5]

Wait, a Sedona? Presume that's w/ the 3.8 engine. Same issue on that engine? -- that this guidance also applies to my 2009 Sedona? Common explanation for oil drizzling (slowly) down across belt side of my engine (and ruining the alternator - after several months) is leaking valve cover gaskets. I changed the front one, but leaking continued. (and ruined a second alternator) Was about to change the rear VCGasket... (may do that yet) But this is the first video I've come across confidently telling me the problem is with the oil pressure sensor (!).... (and min 2:30 shows how....) Yet what an long, long job (anything but an "easy fix) to get down to it!... Any further tips/thoughts from your Sedona experience?

[@hugh3rdof5]

I see the 2012 Sedona had the 3.5l engine. (unlike the 2009 with the 3.8l)... Still wondering if I've got the same issue? Not convinced. Yes, have the wetness behind the belts, but not having same "typical symptom" mentioned of oil "pouring out between engine and the transmission." But what else could be causing the wetness behind the belts....?

[@dinscool85]

Did you have a leak ? Or was just a preventative maintenance. I have the same model Sedona as well.

[@AndyDeMontana]

@@dinscool85 The pressure sending unit cracked (the plastic portion) and oil was pouring out. I got about 15 miles to the gallon of oil. It was pretty expensive driving from Charlotte NC to Central Illinois.

[@dinscool85]

@@AndyDeMontana crazy.. at what miles did that happen? Mine currently has 136k miles on it..

[@garylcarrier]

Great video and commentary!

[@Wubanga777]

Wow... Shout out 2u very focused, patient and thorough Hyundai needs mechanics like you it's funny my 2018 is burning oil and my close mechanic friends all say the same pvc valve probably failing but after watching your video I'm definitely considering trading my truck in ASAP because when I took to the dealership I got the vibe nightmare look on the mechanics face so definitely grateful for your video... Where are you located... Nevermind God bless and may you continue to give great knowledge and service ✌🏿👍💯

[@tycox8704]

One of the most thorough repair videos I have ever seen. Thank You for taking the time to make it. Even for the non-mechanic, it illustrates the complexity of engines and why repairs cost what they do.

[@InTheShop]

Thank you! Comments like this mean the world to me.

[@tommyhouston5149]

Where is your shop located

[@InTheShop]

Ty Cox I closed my shop a year ago to spend more time with my family. I make these videos out of my garage at home.

[@Augiebracerofam]

Great job troubleshooting and not just throwing parts at the problem. Nice that you mention the bolt sizes.

[@InTheShop]

Thank you Augie!

[@leegiordano4964]

@@InTheShop Great video I have the same car with variable valve timing solenoid exhaust Left i believe leaking oil but i can not find it. can you help please

[@andrewbrassard7332]

Thank you for a great video !!! I had to have this repair done 2x’s on my 2013 Sorento. Each time it was almost $800 😬😬😬 and it looks like it’s failing again with 203k on the motor. This sensor is a crappy design and made to fail. With the help from this video I believe I can attempt this myself, thanks again you may have just saved me $800 !!!

[@InTheShop]

Glad I could help!

[@Jerry-fx8ih]

Thank you. Great video.

[@michaelm2573]

Very good video. I had no luck using a wrench to loosen the sensor. I found that using a non-impact 3/8" drive 15/16" deep well socket was much easier. It is a bit shorter than its 1/2" drive counterpart, and that little difference in length gave me just enough room to get the socket on the sensor in that cramped little space. I also recommend that if you use shop towels to cover the intake so that nothing falls in that you make sure to remove them before reassembly. Don't ask me how I know.

[@kimr303]

Thanks l did a oil sensor replaced it you video was great You’re a good technician

[@InTheShop]

Glad it helped! Thanks for watching!

[@r0ck_ste4dy83]

Not sure what kind of idiot would gives this video a thumbs down, but thanks for making it. Seriously. Just did the job today in the driveway, can't imagine how much time or even money you saved my ass. If you're ever in West Michigan, beers on me friend.

[@InTheShop]

Haha Thank you! I'm glad I was able to help.

[@Jamesthevetteman]

Love the video. Good job.

[@InTheShop]

Thank you!

[@edkrim2081]

Good job bro

[@pheatong]

Thanks for posting this... i had to perform this change-out yesterday. It took a while - I took my time - but your step-by-step was a huge help! I couldnt get a 24mm box wrench to work the way you did but I was able to fish a 24mm ratchet into the valley and get it out that way. Got it done... hope I never have to do it again!

[@InTheShop]

Awesome! Glad it helped. Comments like this are why I do this.

[@jchingas23]

Thank you so much, I am going to give it a go! Wish me luck..

[@yvonbombois7853]

Awesome! GOOD job!

[@aaronsherman4244]

Nice video! I just wish I seen it before I pulled the trans! Lol Thank you!!

[@davemcbride832]

very helpful, was thinking rear main, but i see its from the buried oil sensor.

[@christopherbarnes7289]

Great video and advise...also during this repair it would be a good time to replace your spark plugs and also replace your valve cover gaskets if you see oil seepage around where the valve covers seal to the cylinder heads...its a good time to do these when the plenums are off during this repair.

[@viliamutiatia8131]

I think it'll be a perfect time to do a full service

[@Philo_of_Selling]

So thorough, it would be fun to watch even if you didn’t have a kia/hyundai! I don’t see however which model years this affects?

[@hanisalhab7685]

thank you for the videos very helpfull

[@InTheShop]

Thank you for watching!

[@GNX157]

Just an FYI for anyone with this issue. First, there is a bulletin on it from KIA. This may be covered by warranty even if outside it otherwise. Second, my sons Sedona just had this problem, and the oil did NOT leak to the back area of the valley and onto the rear main area. On his engine, the oil from the switch got pushed into the wiring insulation (in with the copper wire), the path went out to the right front (left looking at it from the front of car) to a group of solenoids mounted on the engine above the valve cover. Some of the oil also dripped onto the serpentine belt and got thrown around a bit. The dealer fixed it under warranty and also replaced some wiring since we complained. Don’t know if they got it all though, but it’s documented for later. The oil light would also sporadically illuminate.

[@bigdain6440]

Excellent video quality. I am working through changing the oil filter housing on a 12 sorento. I wasnt able to find any video that went past the oil sensor. Would have really enjoyed a video like this that went through that

[@InTheShop]

Thank you!

[@bigdain6440]

@@InTheShop absolutely. This video helped me figure it all out 🤙

[@skymaster71]

Thanks, that was helpful.

[@InTheShop]

You're welcome!

[@viliamutiatia8131]

Ty, very thorough. Helped me alot, I'm no mechanic but now I feel like one 😅😂👌👌

[@InTheShop]

Awesome! Thank you!

[@diversity2739]

Amazing!

[@zzxxenith]

Don't forget to change the spark plugs when you have everything off, because it's almost the same procedure. They designed this engine to never get fixed so highly technical (they could have placed the oil sensor anywhere but.. ) same deal with the alternator have to take half the engine apart.

[@Saythor]

Amazing video! I love how you show each and every bolt, hose and wire connector! I have had a slow leak in my 2011 Kia Sorento with the same engine for at least 3 years. One shop said it was the water pump seal. Your description of the leak sounds spot on though. Going to look tomorrow and try to see that valley. Do you think the sensor would leak this slow for that long though? Or is this usually an all or nothing failure? It's starting to slowly get worse. Keep up the great work!

[@InTheShop]

Thank you! the sensor could start off as a small leak and progressively get worse.

[@ravindrabharadia2075]

Thanks!

[@jasperthomas8048]

Great video! As a future video suggestion how about replacing the cam advancers on this engine (they are causing noise at cold startup), without timing cover removal?

[@Jetlag28]

Awesome, thanks

[@sergiorodriguez-yy4yd]

Thank you

[@kimr303]

Also good tips and tricks

[@marksprague9480]

Hey , you're doing great work! I have oil leak on my 08 Entourage , at front passenger side of engine. I can see it accumulating on nearby distributor. Any common leaks in this area? I still haven't figured out exactly where it's coming from. Tia. Mark

[@DCMill306]

Awesome explanations wished you we my local mechanic

[@dalelouis4652]

Great video presentation, had this repair done at local shop and since then santa fe loses coolant? No visible leakage and none in oil, any ideas? Throttle body? Thanks for any suggestions.

[@stevefrench8435]

Almost took mine to the shop assuming it was rear main, thanks.

[@InTheShop]

No problem! Hopefully this takes care of it for you.

[@raedsholiabadrabha917]

I'm from Iraq 🇮🇶.. Thank you for this video.

[@InTheShop]

Thanks for watching!

[@jakemiddel]

Thanks

[@ChrisPivik]

Incredible video! I believe this is my issue on my 2012. It seems to be leaking from somewhere above the starter... which, to me, corresponds to the weep hole at the end of the valley you described (on the right hand side of the engine). At least that's where I think it's coming from. Does that sound about right? Thank you so much for taking the time to explain the process.

[@ChrisPivik]

NM... confirmed the oil pressure switch is leaking using my borescope.

[@puckhead7008]

Very nice video! Great work. I have a very significant oil leak from my 2015 Genesis V8 5.0. The leak appears down at the weep hole near the bottom of the bell housing. It leaks quick enough with the car idling in park that I am not driving it. I am wondering if you know that the problem you fixed in your video could be the same on my 5.0. I downloaded the hyundai tech manual for my car (19.00$) and it seems to indicate there is an oil pressure sensor in the valley as you had on the car in the video...but I think the manual is translated from Korean, so its a little unclear. Same set up you think? Thank you.

[@SlipAngleG70]

Excellent diagnostics and explanation. This *may* be a potential issue on the 3.3T engines as well. More owners (G70/Stinger) are seeing a slight oil seep between the engine and trans.

[@InTheShop]

Thank you!

[@donthorndyke3293]

My cadenza has a 3.3.3l had to remove the injector.. they're under the lower plenum on mine

[@georgebusby5764]

Have the dreaded p200a code for the actuator motor. Possible manifold butterfly damage. Was thinking about repairing this and proactively doing the oil switch as well. Have you done this repair yet? No videos on You Tube yet except one showing the manifold with one side bad and not opening.

[@williameramsey1896]

Thanks for your help and support. I have a 2007 kia sedona oil leak and I'm not sure where it's coming from. The shop I had look at it didn't seem to know either. From the Bottom of the Sedona I can see the leak on the passenger side which looks like it's also coming from the oil pan. Do you have any suggestions?

[@haroldlagmay8438]

Tnx for sharing GB

[@InTheShop]

My pleasure

[@jakemckague7896]

My 2016 Hyundai sante fe has a similar engine layout to this, do I need to pull the intakes etc. To replace the filter housing assembly