Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck
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- Опубликовано: 27 май 2020
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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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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. 
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Thanks for your advice! That was exactly what happened to my van after belt replacement. Fixed myself!
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.
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!
Check engine light was on so i lifted the hood and it was still there. Imagine that!!!
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
😂😂😂
Me too🤗😳
same here 😢
does anyone have a fix for this!?!
Good job that you checked that
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
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 RUclips 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.
Dude..thanks!!I guarantee that's my problem I never thought about em getting clogged since their pretty new.
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.
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.
I sorted my P0171 by replacing the fuel filter after watching one of your videos. O2, maf, ignition, vacuum and exhaust system checked out.
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.
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!
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!!!
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!
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!
+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
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.
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.
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.
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.
I have checked EVERYTHING imaginable, have found nothing bad, and still get these two codes.
And the truck runs smooth as can be.
Thank you for the run through possible issues regarding those codes. Very detailed and understandable. Great job, keep up the good work
thank you for making your videos straight forward clear and to the point, with out all the extra jargon.
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!
Many thanks, great the way you take the viewer step by step through the possible faults.
the carb cleaner trick found my leak !! thanks for the tip !!!!! glad I watched your video !
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.
Excellent teaching! I’m glad I finally found this channel!
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
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
Thanks for narrowing it down to about 10 different things
1A auto you guys are the best all of your videos very comprehensive and easy to follow
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!
Great video!!! Can’t wait to troubleshoot my car tomorrow morning! Thank you🙏
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.
Well explained voss!!
You were born for this 👍🏻👍🏻
What a revelation video, straight to the point, very clear with hands to work.
Thanks again for the tips this Chanel saved me a lot of money god bless everyone
I watched a lot of videos for this error code and yours was the most thorough and helpful, thank you!! :)
Dude, you're the man!!! I had both codes on and a stupid hose was disconnected! I was about to go nuts.
Thanks for the heads up, replaced water pump and forgot to reconnect tube into air box creating a P0174, all good thank you
Wow you are amazing! Thanks to you I save money and got rid of my headache, I found a loose hose/vaccim line.
Super!!!. Your delivery is off the hook. Thanks man.
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!
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.
Did you have to take the upper intake manifold off to put new bushings in? And do you have the plastic or aluminum manifold?
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
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!
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
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.
Nicely done, a reasonable common sense approach and diagnosis.
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.
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.
Thanks for this video. It's just the right amount of technical, and saved me a lot of effort.
+voradora Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c
Great video! Right to the point and very helpful, thanks!!
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!
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.
+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
Excellent explanation.God bless you man.it helps a lot.thank you.
+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
Your Suggestions worked. Thanks!
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!
Thank You! A hose leading to the snorkel was disconnected! I had Code P0171 and P0174
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.
Really appreciate the good work from your tech's😁👍
Another Great video A1 Auto 👌🏾!
Very helpful, I had a couple loose vacuum hoses and the airbox not properly sealed.
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.
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.
Thank you, that was perfect, becouse my car is doing that, so now i know wat to do thank you, big help
I got both of these codes. Im a single woman and appreciate you giving at least some advice for checking before I spend a lot of money with the mechanic. IT COULD BE A SIMPLE FIX!! 🙏🏼🤞I have fairh in God but not necessarily my abilities. He can guide me to the correct issue. Bless you!
excellent! very complete - THANKS
I have same vortec engine , after replacement of
new filters (both),
new o2 all (4 ),maf sensör , pvc valve(valve cover) eng.light is not coming back.
But fuel ratio still to high , and consuming more fuel.
Fuel pump pressure ok.
All enjektors active.
No air leak.
Last thing I'm gonna do, clean or replace all enjektors. 💰.
Thanks Sir this fixed my problem👍
Good job you show the possibility of po171 but not mentioned how you finally fix the issue
Incredibly detailed and helpful video.
+Tree Garden Life Thanks for the feedback!
That was an excellent video. Thank you.
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.
+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
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?
Thanks. Mine has scared me twice in 2 years. But it still runs ok.
Bro, super helpful. Excellent video.
Thanks for the very good information
Excelente video thanks for sharing
Best mechanic 💪🏻
A 2015 Malibu I have had the check engine light come periodically with the P0171 code and after several trips to the dealership they finally diagnosed it as a faulty fuel pump. After replacing the fuel pump that took care of the problem for a while. But now I notice that I get a check engine light on with P0171 when the outside temp gets down to about 48 or 49 degrees. I took the car into the dealership but they could never find a solution, after several hours they just clear the light and don't charge me anything. The engine always sounds fine and there's no acceleration problem with the light on. At this point, I really think the ECU software may need to be debugged so not to be so picky if mechanics can spend hours and not find anything. The engine is an ECOTEC 2.5L DOHC, 4-CYL DI/W/WT INTAKE WL & AUTO STOP/START.
+Terry B We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c
My friends Lexus has a torn open hose between the air filter and intake.
+Robert DIY Thanks for the feedback!
I just wanted to let you know,thank you so much for the video u saved me so much money
+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
QUESTION!!!
What if your engine has two banks but the code is only for one of those two banks?
So p0174, would that probably be a faulty injector?
How bad is it to keep driving my 05 chevy cobalt for now until i have someone look at it
Very informative video thank you very much
Thank You, greatly appreciated your video
Great Tips Thanks 😉👍🏽⚙️🔧
Can a bad purge valve also cause these codes? I'm not 100% certain, but I think that might be the case with mine.... It sounds like I hear air coming from it, but I can't get the line off of it to tell for sure
Hey, so I got a used car (Honda Civic LX Coupe 2008) and I wanted to do a tune up so I changed filter and noticed that it had not been changed since the car was bought (100,000 miles) because it had the original Honda air filter. The old filter was pretty dirty. Could it be possible that the computer is reading too much oxygen due to the sudden air filter change? I got the P0171 code but the car is running fine no stalls or anything
Thank you sir it was so well explained.
Very helpful God bless 🙌
Thank you for the video
Excelente, Thank you
Thank u for that, very easy to, understand.
Very informative video!
Great video thank you for sharing!!!!
You just saved me 500$ thank you bro.
Excellent explanations 👍
Thanks my car have that problem I will check that and I hope I can fix mi problem.Thank again for your help.
nicely explained. thanks
Thanks for the information. I really dug your character, Cyrus The Virus in Con Air. Say hi to Nick Cage for me.
I was getting this code and random stalls on my 03 silhouette. New mass airflow sensor for 30 bucks fixed it.
+RamenNoodles4Me Thanks for checking us out! 1AAuto.com
Hey how did you figure out it was that?
I have an 01 ranger and has that code thank you
Love your videos man very informative