Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck

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1A Auto: Repair Tips & Secrets Only Mechanics Know

1A Auto: Repair Tips & Secrets Only Mechanics Know

4 жыл бұрын

Shop for New Auto Parts at 1AAuto.com 1aau.to/c/433/k/scan-tools-cod...
Your check engine light is on, and you got the code P0171 or P0174, "system too lean." That means your vehicle's engine does not have enough fuel for the amount of air it is getting; a lean mixture. An engine running lean can have a negative impact on performance, and can cause damage! In this video, Andy walks you through the steps of diagnosing and resolving the different problems that could cause this code, from the simple: a loose intake fitting or hose; to the more complex: a faulty fuel injector or oxygen sensor.
Find your make and model in our playlists to see if we have a video on intakes, fuel injectors, or oxygen sensors for your specific vehicle:
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⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

Пікірлер: 428
@1AAuto
@1AAuto 3 жыл бұрын
√ *Watch the Video* √ *Buy The Part at 1A Auto* 1aau.to/m/Visit-1AAuto √ *Do it Yourself* √ *Save Money*
@yevgeniymaksimovich8505
@yevgeniymaksimovich8505 3 жыл бұрын
Thanks for your advice! That was exactly what happened to my van after belt replacement. Fixed myself!
@WaqarKhannyc
@WaqarKhannyc Жыл бұрын
Watch out for the A1 out they are scammers. They fucked up my car and they kept on sending a supplemental claim to my insurance every often. All when I've had a seizure attack and I was in the rehab. A1 AUTO YOU RUN SOUTH.
@sickkat5910
@sickkat5910 2 жыл бұрын
You're the only guy that starts at the beginning of the airflow and works it through that way. Everyone else starts at the 02 sensors and works back through electronically.... If the air isn't right going in at the first monitoring point, nothing is gonna come into alignment electronically. Thanks again for a clear, concise, orderly troubleshoot and repair!
@zeezydoesit7416
@zeezydoesit7416 2 жыл бұрын
Wow!! This video just made my day. Opened the hood and realize the intake hose was loose and I tightened it back up and problem solved!! I can’t give this video enough likes
@jackierandall2230
@jackierandall2230 3 жыл бұрын
Check engine light was on so i lifted the hood and it was still there. Imagine that!!!
@travism.3594
@travism.3594 2 жыл бұрын
Check engine came on for me 2 separate times years apart, dont remember the codes but light went off by itself a few days later. Now I'm a certified Mechinix
@MB-df3tg
@MB-df3tg 2 жыл бұрын
😂😂😂
@elizabethhartman3924
@elizabethhartman3924 2 жыл бұрын
Me too🤗😳
@Meatwad.Baggins
@Meatwad.Baggins 2 жыл бұрын
same here 😢 does anyone have a fix for this!?!
@stevenbrown5210
@stevenbrown5210 2 жыл бұрын
Good job that you checked that
@doschmitt1
@doschmitt1 3 ай бұрын
Your advice was excellent! Out of the 10 or so things that could have caused P0174, you suggested first checking every place where air could enter the system after the MAF. Sure enough the oil change guys had left a tube off the air filter box when they changed the filter. Popped it back on and what do you know! code gone. You saved me about $300 on a service call -- thanks for the common sense video.
@evanwilson9925
@evanwilson9925 2 жыл бұрын
This is so amazing! I've been a shade tree mechanic since I was a kid. I basically just learn everything as I go. In fact, I'd even so far as estimate the 30-% +/- of the money I spend on every project is on oopsies and lesson learn. But for vacuum leaks I've always had to pay someone to smoke test it for me. Using your method I just found it in 5 minutes!
@levenge1
@levenge1 6 ай бұрын
Thank you @1AAuto , this assisted me in finding an intake leak after I had replaced the air filter causing both the P0171/0174 code as well as "Stabilatrak & Service Traction Control" errors on my 2007 Escalade.
@17Shkurt2008Pavarsia
@17Shkurt2008Pavarsia 2 жыл бұрын
I hope these tips help someone. Sometimes if it's not the vacuum lines or the mass air flow sensor it could also be a clogged fuel filter, fuel pump, injectors or the high fuel pressure regulator. If that doesn't fix the issue a corroded or a bad coolant temperature sensor can also trigger P0171 becausen it won't read the right temperature and it will mess with air and gas mixture by sending false information to engine's computer and that will lead the car to rough idles and throw P0171. In my case I cleaned the mass air flow sensor, I inspected the evap hoses for any leaks and I still kept getting P0171. Based on all the videos I've watched on KZbin not a single mechanic has mentioned the corroded coolant temperature sensor and that happened to be the problem on my 2005 MK4 VW Jetta 2.0L After changing the coolant temperature sensor the car worked fine and the code never came back.
@badassbees3680
@badassbees3680 Жыл бұрын
Dude..thanks!!I guarantee that's my problem I never thought about em getting clogged since their pretty new.
@Martin210670
@Martin210670 3 жыл бұрын
As usual, very instructive, clear, concise. Always check easy things first, that's my motto with any repair and you nailed it on my issue. As at the beginning of the clip, it was only the MAF that got loose at the air filter box. Put it back, cleared the code. Hopefully it was only that and nothing else comes up. Thanks for your precious help!
@1AAuto
@1AAuto 3 жыл бұрын
+Martin Beaumont Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c
@jimbradley727
@jimbradley727 2 жыл бұрын
It is an excellent video in relationship to these particular codes much more thorough than any I've seen and especially appreciate you referencing the front 02 sensors as a potential problem.
@timj3277
@timj3277 Жыл бұрын
I haven't checked any of this on the car yet but I have to say that was very informative and gives me a really clear process to follow. Thank you!
@wandajekeqa5608
@wandajekeqa5608 Жыл бұрын
Thank you for the run through possible issues regarding those codes. Very detailed and understandable. Great job, keep up the good work
@cyrus138
@cyrus138 11 ай бұрын
I sorted my P0171 by replacing the fuel filter after watching one of your videos. O2, maf, ignition, vacuum and exhaust system checked out.
@richarddiaz591
@richarddiaz591 2 жыл бұрын
I had a P0174 code on a Dodge Dakota 2003, 3.9 V6, it was running rough and occasionally would throw other codes and backfire. After watching this video I went to work with the carb cleaner and noticed a leak between injectors 3 and 6, it turned out to be loose intake screws in the area, I retorqued and problem solved! Thank you.
@PinBall3
@PinBall3 4 жыл бұрын
Also with Fuel Injectors the O-rings could be defective ( cracked or shrunk ) allowing a lean condition as well. Sometimes you can get away with spraying PB Blaster depending on the O-ring condition which will swell an O-ring and provide a temporary fix till you replace them. I did have that happen on a 4.0 Jeep ZJ but it showed as a misfire code.
@edilmendez9153
@edilmendez9153 3 жыл бұрын
Well explained voss!! You were born for this 👍🏻👍🏻
@ronlee1949
@ronlee1949 3 ай бұрын
These were very good tips. I was ready to go by two oxygen sensors, but after watching this video and I checked all the lines and hoses I found one hose disconnected and I reconnected it solved my problem. Thank you very much.
@blaketindle4703
@blaketindle4703 2 жыл бұрын
Excellent teaching! I’m glad I finally found this channel!
@tomvandentop3842
@tomvandentop3842 11 ай бұрын
1A Auto videos are a huge help and very professional, thank you! Started looking into my 2005 Rendezvous that had sat a while. First code was for the P0175 code to change the O2 sensor 1 bank 1.( I should've watched this video first.) Changed the sensor, cleared the code, good for a couple days. Then it threw a vacuum leak code, found a kinked vac line, so changed that. Today the P0171 code and found your video. Wish I could send a couple pics of what I found. Chipmunks built a nest in the airfilter box and also plugged the duct screen to the mass airflow sensor! Vermin!!!
@sasusan1
@sasusan1 3 жыл бұрын
Super!!!. Your delivery is off the hook. Thanks man.
@uriahpierce3602
@uriahpierce3602 6 ай бұрын
thank you for making your videos straight forward clear and to the point, with out all the extra jargon.
@enriquev8832
@enriquev8832 2 жыл бұрын
Great video!!! Can’t wait to troubleshoot my car tomorrow morning! Thank you🙏
@RedMeet12
@RedMeet12 8 ай бұрын
My 2006 2500 HD had a P0171 Code, I took the cover off the top of the engine, started the truck and immediately heard a leak from the drivers side hose connected from the engine plenum to the valve cover, thanks to this video, I found it pretty quick and fix the leaking hose.
@dh1474
@dh1474 Жыл бұрын
Many thanks, great the way you take the viewer step by step through the possible faults.
@MrPeterHaller
@MrPeterHaller Жыл бұрын
1A auto you guys are the best all of your videos very comprehensive and easy to follow
@tammyyaniro5455
@tammyyaniro5455 11 ай бұрын
I watched a lot of videos for this error code and yours was the most thorough and helpful, thank you!! :)
@mikekeziah3064
@mikekeziah3064 Жыл бұрын
the carb cleaner trick found my leak !! thanks for the tip !!!!! glad I watched your video !
@dansweda712
@dansweda712 2 жыл бұрын
Great video! Right to the point and very helpful, thanks!!
@josephbowles4995
@josephbowles4995 3 жыл бұрын
Thanks again for the tips this Chanel saved me a lot of money god bless everyone
@FernandoGarcia-xr7zu
@FernandoGarcia-xr7zu 9 ай бұрын
What a revelation video, straight to the point, very clear with hands to work.
@ivancontreras7601
@ivancontreras7601 2 жыл бұрын
Wow you are amazing! Thanks to you I save money and got rid of my headache, I found a loose hose/vaccim line.
@samuelmedina5700
@samuelmedina5700 2 жыл бұрын
Thanks Buddy, my engine light just went on, checked it with code reading PO171 system too lean. didn't know what the issue may have been, but you just solved my worries. you're Awesome. Thanks Again
@a1mike5
@a1mike5 Жыл бұрын
I just got the same code today, what did you do to fix? I tightened my air filter box and also had a hose like the one he shows disconnected going to see how it drives in the morning
@bereketgebregzabiher1446
@bereketgebregzabiher1446 4 жыл бұрын
Excellent explanation.God bless you man.it helps a lot.thank you.
@1AAuto
@1AAuto 4 жыл бұрын
+Bereket Gebregzabiher Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1AAuto.com
@voradora
@voradora 3 жыл бұрын
Thanks for this video. It's just the right amount of technical, and saved me a lot of effort.
@1AAuto
@1AAuto 3 жыл бұрын
+voradora Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c
@BlackReapersClan
@BlackReapersClan 3 жыл бұрын
Another Great video A1 Auto 👌🏾!
@chriskaprys
@chriskaprys Жыл бұрын
thank you for this. recently installed a new PCV on my crosstrek and got the p0171 after relearning the idle. Checked all the connections and air hoses .. lo and behold, when I reinstalled the rubber tube that runs down to the PCV flange, the tube cracked. I definitely would still be scratching my head if you hadn't given me the confidence to really inspect the air intake system thoroughly. Thanks!
@cesareomiranda4485
@cesareomiranda4485 Жыл бұрын
Really appreciate the good work from your tech's😁👍
@christopherroncone6939
@christopherroncone6939 4 ай бұрын
Dude, you're the man!!! I had both codes on and a stupid hose was disconnected! I was about to go nuts.
@jeffreyhildebrand4867
@jeffreyhildebrand4867 5 ай бұрын
Thank you for this video. Po174 came up on my 99 gmc the other day. I had just had a new rotor and distributor cap installed and your instruction lead me to a hose that the mechanic forgot to reconnect. I did and it’s running like a sewing machine.
@Fishin4ReelTV
@Fishin4ReelTV 3 ай бұрын
Very helpful & detailed video. Walk through was very straight forward and easy to understand. Hopefully I will be able to fix my truck & get rid of those code. I’ll be back with an update soon!
@bigbidness1457
@bigbidness1457 11 ай бұрын
A man I my light been on for an minute I overlooked ur video after that. I seen no issue in so many other words Thankyou good day.
@charlestatakis9363
@charlestatakis9363 8 ай бұрын
Nicely done, a reasonable common sense approach and diagnosis.
@madimakes
@madimakes 2 жыл бұрын
yep was exactly my issue. 0:51. i must have jostled this while trying to get to the headlight. :facepalm: thank you! Thank you OBD reader and thank you 1A Auto Repair. fix was all of 2 minutes
@crex7395
@crex7395 3 жыл бұрын
MUST READ! I was going crazy trying to get that error code fixed. I have a 03 v6 4.2 and turns out the leak came from bolt bushings at passenger side intake lower portion. Ford released a service bulletin TSB 04-17-04. Hope this helps for anyone who struggled as much as I did.
@foxmulder216
@foxmulder216 2 жыл бұрын
Did you have to take the upper intake manifold off to put new bushings in? And do you have the plastic or aluminum manifold?
@nettosud
@nettosud Жыл бұрын
Bro, super helpful. Excellent video.
@charlesjackson7127
@charlesjackson7127 5 ай бұрын
Your Suggestions worked. Thanks!
@gordhoenow6322
@gordhoenow6322 2 жыл бұрын
That was an excellent video. Thank you.
@wllinc777
@wllinc777 2 жыл бұрын
yep you were a great help did a oil change and they left the hose unhook. Put it back and it wwas fixed. Thanks a lot
@simmons6014
@simmons6014 2 жыл бұрын
Thanks Sir this fixed my problem👍
@Gearhead68
@Gearhead68 5 ай бұрын
Thanks for this helpful video. I had the P0171 code on my 2019 Colorado, and found a loose hose on the intake. I reconnected the hose, started the engine, and the check engine light was off!
@atomicdmt8763
@atomicdmt8763 2 жыл бұрын
excellent! very complete - THANKS
@lawrencepellegrini2687
@lawrencepellegrini2687 Жыл бұрын
Thanks for the heads up, replaced water pump and forgot to reconnect tube into air box creating a P0174, all good thank you
@MegaMilagro1
@MegaMilagro1 3 жыл бұрын
Excelente video thanks for sharing
@blobcsgo7190
@blobcsgo7190 Жыл бұрын
Thanks, got these same codes, and it was in fact a bad hose going from the valve cover to the top of the manifold on my chevy silverado 2007 4.8l Thanks!
@highviews4524
@highviews4524 3 жыл бұрын
Just checked my 2012 Honda Civic and found a 5/8" ID hose disconnected and reconnected it with the spring clamp. Hopefully that is enough. Great video!
@fixitfern5339
@fixitfern5339 2 жыл бұрын
Thanks for the very good information
@fixit4182
@fixit4182 2 жыл бұрын
Very informative video thank you very much
@stephencannon3140
@stephencannon3140 3 жыл бұрын
Good starting point. The P0171 and P0174 are basically the same code. The difference in the number is another troubleshooting hint. 0171 USUALLY Bank 1. 0174 Bank 2. This is for V type engines. Consult Your factory service manual for the layout. Rear Whee Drive vehicles the banks are side of the vehicle and although should be standardized not necessarily so. The general layout for my RWD V6 for example Bank 1 is on the passenger side of the engine compartment looking forward from the drivers seat. ALwAYS check the layout, mine is 1-2-3 on the passenger side and 4-5-6 on the drivers side. Some might be 1-3-5 and 2-4-6....... DO NOT confuse cylinder layout with firing order. I just got a P0174 and cleared for now. When the weather gets better I will check in more detail but not panicking yet!
@Gr8nezz
@Gr8nezz 2 жыл бұрын
Very helpful, I had a couple loose vacuum hoses and the airbox not properly sealed.
@CoolAce1
@CoolAce1 3 жыл бұрын
Incredibly detailed and helpful video.
@1AAuto
@1AAuto 3 жыл бұрын
+Tree Garden Life Thanks for the feedback!
@jimtownsend7899
@jimtownsend7899 Жыл бұрын
Hey, that's my engine! The GMC 5.3L. I need to replace my purge valve this weekend to fix a P0440. And while I'm under the hood, I'll clean my MAF sensor and check all my connections.
@andrewcasares1413
@andrewcasares1413 7 ай бұрын
Love your videos man very informative
@dennissecor8092
@dennissecor8092 Жыл бұрын
Great video thank you for sharing!!!!
@darktoadone5068
@darktoadone5068 3 жыл бұрын
My 2013 Sierra 1500 just had a P0174 code, I can check all what you just covered over, I hope it doesn't end up being a lazy fuel pump. But I don't think it could because I can hear the pump engage when I turn the key on and the engines cranks up always on the first turn of the key, a fuel pressure check should indicate if it is though.
@BigmoRivera
@BigmoRivera Жыл бұрын
Great Tips Thanks 😉👍🏽⚙️🔧
@Filioque_
@Filioque_ 2 ай бұрын
Thanks for narrowing it down to about 10 different things
@geradosaucedo1615
@geradosaucedo1615 3 жыл бұрын
Thank you for the video
@benhazeem7656
@benhazeem7656 Жыл бұрын
Very informative video!
@rudytapia943
@rudytapia943 2 жыл бұрын
Thank you, that was perfect, becouse my car is doing that, so now i know wat to do thank you, big help
@MarkAnderson-vg5vq
@MarkAnderson-vg5vq Жыл бұрын
Thank You, greatly appreciated your video
@20tea
@20tea 3 жыл бұрын
Just figured mine out! Replaced the injectors and intake manifold. After much headache chasing a vacuum leak, I found my new set of injectors were junk. Could be injectors as a cause of lean code or rich code. My case for lean was the injectors. Didn't want to redo tje intake manifold a 3rd time. Was worried I had a crack in the manifold.
@mahmoudmuwalla2397
@mahmoudmuwalla2397 3 жыл бұрын
Good job you show the possibility of po171 but not mentioned how you finally fix the issue
@col3life
@col3life 9 ай бұрын
Thanks very helpful and nice touch at the end 😂! Any videos on P0300 with others like P0302, 4, 6?
@fridaymwamba6637
@fridaymwamba6637 3 жыл бұрын
This is the most elaborate video on the subject that I have seen. So clear, detailed, comprehensive. I have a P2177 system too lean off idle bank 1. I have noticed passed 3 months that the vehicle doesn't start easily as it bid before. It now starts on third or fourth attempt. I am guessing it is more to do with fuel delivery than oxygen sensor.
@1AAuto
@1AAuto 3 жыл бұрын
+Friday Mwamba Thanks for checking us out and the feedback! If you are having troubles getting this to crank over it sounds like possibly an issue with a fuel injector(s) or the fuel pump not working as it should (low pressure). Having this diagnosed is the best way to figure out exactly what is causing this rather than replacing one part and it being another. 1aauto.com
@MarioGroleau
@MarioGroleau 2 жыл бұрын
Thank You! A hose leading to the snorkel was disconnected! I had Code P0171 and P0174
@emmettturner9452
@emmettturner9452 7 ай бұрын
P0171 with intermittent Check Engine light on my 2000 Pontiac Montana with the GM 3400 SFI here. I found a rubber vacuum cap on the upper intake manifold that was turning into dust and mush. Sure enough, there was a pinhole of light visible through the cap. Just replaced it. Unfortunately, I also have a P0452 that’s likely from the replacement fuel the shop put in last year. It was making a high-pitched whine from the start and the shop refuses to warranty it just because it’s technically still working.
@andresnieves8820
@andresnieves8820 2 ай бұрын
Excelente, Thank you
@sole_valley303
@sole_valley303 3 жыл бұрын
I just wanted to let you know,thank you so much for the video u saved me so much money
@1AAuto
@1AAuto 3 жыл бұрын
+Tony Vill Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c
@canyuto
@canyuto 3 жыл бұрын
Thank you, your videos are great. In this case, I had a hose disconnected from the filter box, once attached I re checked and it was fine. Thanks again.
@1AAuto
@1AAuto 3 жыл бұрын
+canyuto Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c
@fireboy5043
@fireboy5043 6 ай бұрын
Thanks Bro Great Info U the Man💯💯 Just solve my Problem🍾🍾🍾
@donens9310
@donens9310 Жыл бұрын
Great video. Not covered, can a gas cap, vent problem cause a lean code as well? Since low fuel delivery would result in lean as well?
@ArtWAyala
@ArtWAyala 3 ай бұрын
Thank you sir it was so well explained. Very helpful God bless 🙌
@jeffalan6339
@jeffalan6339 3 жыл бұрын
It helps. I have P0171 and P0300, the 03 silverado runs very rough when near op temperature, black exhaust and spitting sound as well. Ah modern vehicles, I wonder if I can buy my old Nova SS back, simple reliable and durable. Today's stuff start it wonder when is something going to fail? Then what is it and caused the failure.
@nostradamus4828
@nostradamus4828 2 ай бұрын
Excellent explanations 👍
@unwillingduetolackofintere8999
@unwillingduetolackofintere8999 Жыл бұрын
Thank u for that, very easy to, understand.
@angelsaucedo2231
@angelsaucedo2231 2 жыл бұрын
thanks for the information👍
@leobardorocha3081
@leobardorocha3081 2 жыл бұрын
Exelent video brother...help me a lot....
@GMC229
@GMC229 2 жыл бұрын
Best mechanic 💪🏻
@Thunder_Dome45
@Thunder_Dome45 2 жыл бұрын
Thanks. Mine has scared me twice in 2 years. But it still runs ok.
@IknowRicky
@IknowRicky 3 жыл бұрын
Great trick. Thank you very much.
@1AAuto
@1AAuto 3 жыл бұрын
+ricky sixstring Thanks for watching!
@southern_merican
@southern_merican 2 жыл бұрын
Very helpful 👍
@cal48koho
@cal48koho Жыл бұрын
nicely explained. thanks
@RobertDIY
@RobertDIY 2 жыл бұрын
My friends Lexus has a torn open hose between the air filter and intake.
@1AAuto
@1AAuto 2 жыл бұрын
+Robert DIY Thanks for the feedback!
@Bimmertuner55
@Bimmertuner55 Жыл бұрын
Fantastic video great info
@alfredharrison597
@alfredharrison597 11 ай бұрын
Listen for hissing or use carb cleaner and spay on some areas (hoses or where air flow would be, avoid electronics if possible) while engine is idling to see if the carb cleaner smooths out the idling, if no hiss or no change with idling and carb cleaner, check fuse for O2 sensor (usually under hood), if fuse is good, could still be a bad O2 sensor, if you want to try replacing the first upstream one whichever bank its on (cylinder 1 or cylinder 2 for the banks respectively) can try that route, as its usually cheapest. Harder down the line and more cost involved is fuel rail/fuel injectors, fuel filter and pump, EGR and PCM (Powertrain control module), good luck guys and dont burn yourselves on hot exhaust. Hot exhaust is best and easiest way to remove 02 sensor but its also the most dangerous, so keep that in mind and focus on safety.
@carloscuevas5658
@carloscuevas5658 2 жыл бұрын
Great Job 👍
@macguyver8698
@macguyver8698 3 жыл бұрын
You just saved me 500$ thank you bro.
@galenlewis59
@galenlewis59 2 жыл бұрын
What about having excessive fuel additive in the fuel? Will that create the code? Awesome video very informative.
@thelazyhandyman8581
@thelazyhandyman8581 2 жыл бұрын
I'm thinking that could be my issue too. I added 2 different types of additives
@syfodias-jedimaster
@syfodias-jedimaster Жыл бұрын
Very nice video may I ask is it possible for the mass air flow sensor to be dirty that could pause it?
@billv5954
@billv5954 3 жыл бұрын
Great video. Now I know how to deal with the shop. I think my problem is in the heater AC vacuum line. This shop replaced the AC control head and ever since then it did not seem to work right and now am getting the PO171 174 system too lean code.
@1AAuto
@1AAuto 3 жыл бұрын
+Bill V Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c
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