Troubleshooting & How To Fix Code P0172 - 2010 Subaru Forester
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- Опубліковано 13 сер 2024
- This episode Dana is chasing down the cause of Code P0172 on her 2010 Subaru Forester which is causing the Check Engine Light (CEL). Going through the steps on troubleshooting it, she cleans and inspects the MAF sensor, throttle body as well as replaces both the engine and cabin air filters as both were well overdue. Hopefully these steps will resolve it.
Channel Creator Shoutout: Sick Nation - / sicknation1
//Timeline:
00:00 Episode Intro
00:45 Channel Creator Shoutout
02:05 Tool Coverage
02:50 MAF Removal/Inspection/ Clean
05:05 Top Air Intake Removal/Inspection
07:40 Throttle Body Inspection/ Cleaning
08:30 Replacement of Cabin Air Filter
11:10 Replacement of Engine Air Filter
13:15 Reinstall of all parts removed
//Contact:
For business inquiries only, please contact us at SpiritedWrenchers@gmail.com
//Parts Used In Episode (Affiliate Links):
- Bosch Cabin Air Filter - amzn.to/3teltYk
- Bosch Air Filter - amzn.to/3fZ5o5b
- Single tray Gripty Tool Mat: amzn.to/2NMW9JJ
//UA-cam Episode Recording Equipment (Affiliate Links)*
- Kimafun Dual Lavalier Wireless Mics: amzn.to/3upkp57
- Mactrem Professional Camera Tripod: amzn.to/2ZNHhNx
//Music Tracks(Provided royalty free through Epidemic Sound):
Fluorescent- Cushy
DISCLAIMER: This video and description contains affiliate links, which means that if you click on one of the product links, I’ll receive a small commission (at no cost to YOU). This helps support the channel and allows us to continue to make videos like this. Thank you for the support!
#SubaruForester #SubaruCheckEngineLight #SubaruMaintenance - Авто та транспорт
Hello everyone! A quick follow-up for this video: This specific code did not return, but the CEL did come back with more P0000, P0301, P0302, P0303, and P0304 codes. These are not related to the P0172, and had been occurring randomly over the previous 2 years. The misfires were real, albeit nearly impossible to observe, and ended up being the exhaust valve guides in the heads. That video can be found here: ua-cam.com/video/KGOxTT1Sb_g/v-deo.htmlsi=O8rinlxqT_fV-mJi
Thanks for watching and we hope this helps! Take care & stay safe!
Why no follow up? The Cabin filter is completely unrelated to anything engine. Did it fix the code?
Hi Chesky, thanks for watching! You are correct that the cabin air filter doesn't have any direct bearing on the functionality of the engine or the cause of this code. I usually just replace both at the same time to prevent either air filter from getting too bad. As far as the code goes, my apologies for the lack of follow up! This specific code did not return, but the CEL did come back with more P0000, P0301, P0302, P0303, and P0304 codes, which ended up being the exhaust valve guides in the heads. That video can be found here: ua-cam.com/video/KGOxTT1Sb_g/v-deo.htmlsi=O8rinlxqT_fV-mJi
Thanks for helping keep us honest! Take care & stay safe!
@@SpiritedWrenchers Thanks for the reply - are you saying that once the P0172 went away - the other codes appeared? I did the this , but unfortunately it wasn't my fix. I'd hate to think that ther's another nightmare promblem coming. Cheers.
@@cheskybaba4864 It was not immediate and the P0172 was not the gateway code to the others. The other codes had been intermittent on our Forester for 1-2 years at that point, so she could have thrown the P0172 as a separate issue or as part of the intermittent misfire issue that had been ongoing. I want to say we didn't see the P0172 return even when we received the P0420 for the catalytic converter, but I would check your O2 sensors if you're still experiencing the P0172 after cleaning up everything you can up top; might be a $50 fix from Amazon. Hope this helps and you find your solution soon; take care and stay safe!
Wow ive been a mechanic for 20 years and you are more competent than most guys i know 👏
Hi che1421, thank you for watching for the kind words! My father insisted on teaching me mechanical basics when I got my first car, and then how to read from the Chilton and Haynes manuals to repair my car when I was away at college. Compliments like this help remind me how important it is to me that we continue teaching mechanical maintenance and repairs to ourselves, our kids, and others! Take care and stay safe!
This worked well on my 2010 Impreza OBS with 180K, highly recommend to perform the idle relearn once this procedure is completed. There was the smallest amount of dust that had built up within the MAF, replaced the filter as that was due as well. Runs really well.
Hi Brian, we are so happy this helped! Idle relearn definitely helps. I still wonder how the MAF and TB even get so dirty... wishing you another 100k miles of joy with your OBS!
Absolutely super job; you're the best Dana. However at the very end you comment about re-setting the computer and the code. Do you have a video on how that is done? My 2008 Impreza is showing the identical issue and with your very clear guidance I can probably do the job myself. Thank you!
Hi Django and thanks for the very kind words!! We didn't plan on putting out a video on just the how-to reset the idle speed on a Subaru, but I can certainly explain it here.
The best way that we've done it, is to turn the key to "on" for about 30 seconds before starting the engine, then let it idle for 5 minutes. Turn the ignition off, then after a minute, repeat the process, this time letting it idle for 10 minutes. After this, your Subaru should remember where the idle rpm speed is, and you won't have any issues with stalling or loss of power while driving. You could, of course, just drive the car as normal and after 2-3 drives, the car will reset itself through normal use, which might be a better option if you're unable to safely idle the car for whatever reason. Hope this helps; take care and stay safe!
@@SpiritedWrenchers Whoa Dana - you are very generous with your time and know-how; thank you very much for this extra-thorough follow-up!
Nice job. Very detailed and easy to understand instructions. I'm surprised to see you have below 500 subscribers. But I'm sure it's gonna shoot up soon
Hi Seamuzzaman. Thank you for watching, subscribing and sharing the kind words. We greatly appreciate it. We'd certainly like to be above 500 as well but I'm sure it will happen soon. Your support will help us get there. Stay safe. Cheers.
Great job, Dana. You made it all look so easy. See you next time.
It's an easy job and gets easier each time. Thanks for watching and the kind words.
I like that tray idea! Just want to say that a lot of people suggest to first disconnect the battery and let power drain for 5 minutes or so before unplugging sensitive sensors such as the maf, so as not to stun or fry them. Just sayin'. Thanks for the well done vid.
Thanks for watching! I was not taught to unplug the battery first, but that does make sense for safety. Thank you for sharing that advice with us! There is also a method to use after disconnecting the battery (which also clears the codes) in order for the car to relearn idle. I remember thinking I had broken the car the first time I drove after disconnecting the battery and it kept stalling.
The tray is actually really neat and comes in different colors, we did a review on it awhile back on our channel. We still use all our gripty mats! Link to our review here: ua-cam.com/video/a2unWzk-L3A/v-deo.html
This is so awesome you both work on things and do everything together!
Incredibly lucky to have someone we can share our passions with. It certainly makes it more fun.
I'm having trouble with my subaru 2011 forester. on a hot day here in los angeles i turned on my ac noticed it will only pump col air when driving at high speeds or when temp is cool turned off my car and when i tried to turn it back on it hesitated. friend of mine clean my battery its from 2017 so def need a new battery but when i stopped using the ac it was running next dat webt to get the code read and it showed mass air flow sensor bank one the guy checked my air filter it was good when when he checked my cabin air filter it was black what do you suggest? bc after he cleared the code my car is running good havent used the AC. could a clogged cabin filter have done this domino effect ?
Hi Roni Hernandez, thanks for watching and asking. A clogged cabin air filter can have all sorts of negative impacts on both engine and AC performance. Its possible (no way to confirm) that the code could have been related to the cabin filter, but more likely to be unrelated. The MAF in and of itself gets dirty from regular driving, so if you've cleaned the MAF, replaced the engine and cabin air filters, the next thing I would look at for AC would be relay and fuses and if those are good then the blower motor. At the age of these Foresters, I've seen in online forums that the blowers are starting to fail. I sold my 2010 before it ever got to that point, but, hopefully your AC issue was purely related to the filter. Only one way to find out.... now that the cabin filter is replaced, run it! Good luck, and take care!
Sorry I'm a little late on watching but I'm definitely here to support you guys!
Bro. Its ok. Heck, we've been camping all weekend. Life isn't just about YT.
Cleaning the MAF sensor solved the code in my 06 Outback. Thank you!
Thanks for watching and I am so glad that it helped! Easy fixes are my favorite!
Just got a project 08 impreza hatchback thank you tomorrow is going to be fun 🤩
Thank you for watching and sharing. We appreciate that. Sounds like a great project car. Let us know how it goes. Cheers!
Wow I can't believe the love here that was beautiful thank you guys so much!
Well deserved
Where is the proof that cleaning helped solve the error problem? I don’t see anything before or after the diagnosis.
Thank you for watching and asking. We appreciate it. We didn't have any other issues with the code coming back for our Forester however we've heard from a couple of other viewers that this remedy wasn't a permanent fix for theirs. That would only lead us to believe there is another related problem causing it to happen again. We no longer have the Forester so a follow up video isn't possible. Hope that helps. Cheers!
There goes my Saturday night \ Sunday
@@kb1qzh lol. We totally understand how that is. Thank you for watching and sharing. We appreciate that and wish you luck on your project. Cheers!
Excellent video, well done. Thanks.
Thank you very much Tony. We appreciate you watching and sharing the kind words. Stay safe out there & Have a Happy new year!
Question of the day. Did this fix the problem or did the code return?
Hi Scott, thanks for watching and asking. If memory serves me correctly, the P0172 didn't return. We did, however, get the P0301 and P0302 misfire codes again on the 2010 Forester. In our other video, ua-cam.com/video/KGOxTT1Sb_g/v-deo.html, we walk through that diagnosis and results from finding out our exhaust valve guides were slipping. Hope this helps! Good luck and stay safe!
@@SpiritedWrenchers Thanks for the feedback.
So did the Air filter cleaning the map actually sensor care the P0172 code sytem too Ricd band 1
Hi Jake, thanks for watching and asking. If memory serves me correctly, the P0172 didn't return. We did, however, get the P0301 and P0302 misfire codes again on the 2010 Forester. In our other video, ua-cam.com/video/KGOxTT1Sb_g/v-deo.html, we walk through that diagnosis and results from finding out our exhaust valve guides were slipping. Hope this helps! Good luck and stay safe!
So did the air filter and cleaning the map actually cure the P0172 code or is that why you went after the CATs and O2 sensors?
The catalytic converter and O2 sensors were replaced before this. Cleaning the MAF and air filters did resolve the P0172 for us! Its a good place to start, but may not resolve the code for everyone.
What prompted the CAT and O2 swap?
@@chardock Actually it was an engine code of P0420 that prompted the catalytic converter swap. Forester gave me the code a couple of years ago and I just cleared it to see if it came back. When it did, I knew it was time. I paid our local dealership to test my cat and O2 sensors before we began buying expensive parts, and they confirmed the cat and front sensor were bad (front O2 sensor also called A/F sensor).
@@chardock I'm adding in links to our catalytic converter episodes below. It was an adventure!
Part 1:
ua-cam.com/video/N1G6UhjTeUU0/v-deo.html9999-0001-L
Part 2:
ua-cam.com/video/vhy2VvnsbEY/v-deo.html
Really liking your videos will help me alot with my new to me forester !!
Hi Chalie Teufel, I'm so glad that you find our videos helpful! It really makes our day to hear such positive feedback, thank you for watching!
Awe thank you so much for the shout out!
No sir....thank you!
You guys are so amazing for that!
The true Dom and letty right here ❤️❤️❤️❤️
🤣🤣🤣🤣. 😎✊
The mass airflow sensor: I always struggle with those clips, would love some further insight on how best to deal with them, especially when they are in that tight spot and you cannot see them too well.
Thanks Sam. Much appreciated. Are you referring to the electrical clips or something else?
@@SpiritedWrenchers the electric clips
@@SamCarleton small flat tip screwdriver has been my go to. Have one that fits into the retaining tab so it can easily bend it.
If the maf sensor is the issue how long after would the check engine light disappear?
Hello and thanks for watching and the question! Any time a fix is done with intent to resolve a check engine light, if you are waiting for it to clear on its own it will just take a few run cycles (on/drive/off) before it clears. The alternative to this is to disconnect the battery for 20-30 minutes which will clear the code immediately, but then you will need to give your vehicle time to relearn idle if it's a Subaru (I'm unsure about other makes).
But did that fix the issue?
Hi MDM, thanks for watching! We will need to pin a comment to this video as this is our most commonly asked question. Yes, cleaning the EGR did resolve the P0172 for us and the code did not come back.
However, a few months later we received P0000 and other P030x codes indicating misfires were occurring and chased them down to be caused by a slipping exhaust valve guide in the heads.
Hope this helps; take care and stay safe!
Will this also work on 2013 impreza sti?? Any info helps
Hi Adrian, thanks for watching and asking! With Subarus, we have found that cleaning the MAF and ensuring air filters are clean and in tact always helps. We can't confirm it would solve the error code in your STi, but cleaning the MAF is likely going to be the first step in diagnosis completed by any proper dealer or performance shop. It won't hurt to try it out, so long as you use the proper cleaner. Hope this helps, and we wish you the best!
Amazing video!
Ty
Nice to see a real fixer as opposed to a Chris fixer.
Thank you David for watching and sharing the kind words. We weren't sure what you meant at first truth be told so we had to look it up. LOL. Thanks for the compliment. We really appreciate it!
❤️❤️❤️❤️❤️
It always seems like every time I clean one of my mass air flow sensors it never works lol
Same for me. Lol
Lol haha you guys can do it we'll have to set something up soon! And you're definitely welcome you guys are great!
Thank you
Great info!
Thank you for watching. Glad you liked it.
My car has been running rich for about three weeks now. I am a mailman who works about 60 hours a week driving my own car. I drive about 1300 miles a week.
The code I’m getting back is for “evap emissions system”
Changed multiple sensors including MAP, MAF, Fuel tank pressure sensor, and a few others.
I don’t hear any vacuum leaks, and I got a new gas cap.
New air filter, and fuel filter.
I’ve been stumped on this one, and I’m not finding enough time to work on it due to overtime at work, and working on UA-cam.
Due to The vehicle running rich, every once in a while I get a code for my O2 sensor.
I’m going to try cleaning up the throttlebody, and the passenger side filter.
Good timing on the video👍🏼
That's awesome. Hope one of these steps will help with yours. As I'm learning with her Forester, it is really a journey. We have already replaced the CAT and both sensors on it (upcoming episode once I can finish editing it). A friend, and fellow Subie tech just suggested 2 other items I've asked him to leave in a comment so that will likely be next.
Wow that hose clamp was easy I have some on one of my classic cars that takes pliers to get them to move lol
She rebuilt her motor a few years ago so its all rather fresh. Those on my mustang are bad too. The break before I can get the screws undone. Lol
Does your car lose power and hesitate when you had this issue?
Hi Mark, thanks for asking this! I honestly cannot remember, which probably means I was not experiencing a noticable difference in driveability. A very dirty throttle body might cause power loss, but it would have to be pretty caked to do so.
Mine is worst engine hesitate and lose power, I haven't check it by mechanic. The last time I've done my car was timing belt kit and spark plug change. Then after the mechanic change the spark plug the engine has vibration very little I'm not sure if that's affect the p0172 code error
@@markmurillo3687 , Sorry to hear that. Are you actually getting the P0172 code or chasing some symptoms? Have you taken it back it back to the mechanic who did the work since these problems started after that was done?
Did it fix the problem?
So far, yes! I haven't had this code return since I did this maintenance job. My P0172 was unlikely to be due to an O2 sensor since we just replaced them with the catalytic converter. There are other things that could cause the code, but I like to start with the easy items.
@@SpiritedWrenchers So far so good, thanks!
@@sietafak Excellent. We're really happy it helped. Stay safe and see you next time!
I just love the sound of ratchets lol
LOL
Having mad trouble fixing it, it stutters. Plugs, sensors, intake, filter.. starter coil.. all good. 2011 impreza XV from Japan.. i am in south America pls help!
Hello! Excellent username! The basics of an engine are just fuel-air-spark. I believe the 2011s have the FB engines, not the EJ as we had in the Forester. That said, a lot of the same components should be inspected and cleaned as you have already done to chase the easiest diagnosis. I'd say the next steps would be ensuring the throttle body and plug wires have no issues, followed by testing fuel and compression if no codes are active. If it's throwing any codes, that would be the best start to chase down, since a clogged catalytic converter or bad O2 sensor can cause severe reduction in power and function. While we are not as familiar with the FB engines, we do wish you the best of luck. Hope this helps; take care and stay safe!
@@SpiritedWrenchers I believe it is an EJ engine, it is 2.0 manual made in Japan. Mech says there are no plug wires. Catalytic converter? It is throwing a code p0172 if I am not mistaken
@NONEOFYOURBIZ69 could be a defective MAF, not just dirty. Can you swap it with a friend's to see? The EJ engines in that generation of Impreza and Forester are all 2.5L, and the 2.0L are the FB. I do know that even the FB engines have wires, but I believe the mechanic is correct that each plug has its own coil rather than 1 centric coil pack like our EJ253 Forester. This makes changing the plugs all the more difficult, but the coil packs and plugs are not wireless. The FB engines also have the timing chain rather than a belt, and there was an active issue in North America for oil consumption. If you have the FB and it is consuming oil, you will likely need a new short block (which, I truly hope your issue is something Cat or TB related; much cheaper!).
@@SpiritedWrenchers replaced the MAF
@NONEOFYOURBIZ69 not sure what to chase down next, to be honest. You've done everything that we would at this point, including taking it to a mechanic. The only next step would be to test the heads. Our P0172 ended up being a result of slipping exhaust valve guides, and we needed to buy new heads.
Don't you want to do a throttle body relearn?
Hi enduroelite, thanks for watching and asking! The process for throttle body relearn is the same as the idle relearn. When everything is reinstalled, idle the car for 3 minutes. Then idle again for 3-10 minutes. This would prevent the car from stalling upon returning to idle after running while driving.
That's my problem probably I don't let it dry long enough lol
🤣🤣🤣