Causes and Fixes Ford P0174 Code: System Too Lean Bank 2
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- Опубліковано 20 сер 2023
- How to fix a Ford P0174 engine code: Fuel Injection System Too Lean Bank 2
A lean condition exists if the engine is getting more air than fuel in the cylinders. (Air/Fuel Ratio is off)
P0174 Code is problematic code since it can be caused by several things.
Ford vehicles with V6 or V8 engines, Bank-2 is on the Driver side. A 4 Cylinder has only Bank-1.
Possible Causes of a Ford P0174 Code:
⦁ Oxygen Sensor (Bank 2 Sensor 1)
⦁ Mas Air Flow Sensor (Codes P0100, P0101, P0102, P0103, P0104)
⦁ Clogged Fuel Filter
⦁ Fuel Pressure Regulator
⦁ Weak Fuel Pump
⦁ Vacuum Leak
⦁ Bad Fuel Injector
⦁ DPFE (Differential Pressure Feedback Sensor) (P0401 code)
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You just gained a subscriber! Really informative video.
I cleaned the MAF sensor, unhooked the battery completely unplugged all the oxygen sensors and replugged them in along with the MAF sensor and rehooked the battery no check engine light no codes
You don’t say??? You drained the kam memory and the cel left lol
@@zues2013 I ended up having to clean the MAF sensor with MAF sensor cleaner and that did it because cel came back and I had a rear o2 sensor up front and one with bad wiring so I just replaced them both and cleaned the MAF sensor and all good no check engine light for months now
Awesome that you don't have any codes for a while. When you unplug the battery, it will clear the stored codes, so that doesn't necessarily mean that the problem went away, but if the codes don't show back up for a while, that's usually a good indication that whatever was causing the code is now fixed.
I've got to take a moment to recognize the fact that I thought your video your illustrations and your mannerisms as far as convening the messages that you were conveying I have been fighting with my 2013 F-150 Limited I'm truly I wonder if anybody's really tried to fix it. I think that's why I'm going to go ahead and just take it to the dealer and suck it up that suck up the fact that I bought a vehicle that has issues and that's going to happen in many cases that's why I always leave some extra cash in the budget when buying a vehicle. Regardless there's going to be something that's going to need to be fixed, changed, or adjusted unless it's supposed to be certified LOL nevertheless you were explaining technical issues and things in layman's terms which was awesome and it wasn't a big " show", a "production" if you will. I know for myself I'm going to watch it again even though my problem probably goes a little deeper, but there may be some things that we don't think of until seeing your video and then it actually does help. So thanks again I know that was a long one but it was a well-deserved review. Don't get me wrong there are some videos that have production and they do get very detailed in the video and it does help because the many times the visualization is what helps. For instance a wiring diagram. I could go to sleep on a wiring diagram unless there's somebody there that might be able to guide or direct specifically what we're looking for we're looking for.
..... thanks again
Thanks for all recomend
Excellent content
The spray they use to find vacuum leaks is starting fluid. It raises the idle of the motor if there is a leak where sprayed
Spraying starter fluid on hot engine can cause a bad day.
@@PhilphilPhillip-uz4ps that's why you spray the lines and not the motor lol
After hooking up a smoke machine, I have a lot of smoke coming from the coolant hose where my thermostat is, its a big air leak i hear a hissing sound when the engine is running then it starts shaking
If it is bank specific that pretty much rules out fuel pump or filter issues.
How do you test the O2 sensor, P0174 on 98 f150, only code that comes up.
So what was the fix?
If it was a bad maf sensor why would it only affect one bank and not both
My question too. Everybod keeps saying the MAF but i replaced it. Maybe reconnecting the battery will re-initiate the fuel trim learning?
Thanks 🔥
what if i have a p0171 and a p0174 at the same time? what would be the first thing? after it gets to operating temp it smooths out. when cold doesnt want to idle.
I would test the MAF sensor, check for a vacuum leak, and do a fuel pressure test to see if it is in the fuel delivery.
Bad intake gasket if it gets better as the engine heats up !
Following
What was solution
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I just bought a 1998 Ford f150 Triton V8, I had it smogged and it gave a "p0171 system too lean (bank 1),"as well as a "p0174 system too lean (bank 2)" and I'm trying to figure out myself, without a shop or ability to pay a mechanic, how to fix what's wrong, is there any way you could please offer some advice or suggestions? Thank you so so much for your time
The issue is affecting the whole engine, which is something like a weak fuel pump, clogged fuel filter, bad sensor, weak coil pack, or anything that would affect the entire engine.
Been doing diy smoke test at home and only noticing the smoke coming from the IAC valve (no the top cap but actually the “butt” of the valve if that makes sense, not where it attaches to the throttle body) and the oil cap. Anybody know if any of these is normal? Im only getting g the P0174, already replaced O2 sensors, fuel regulator, EGR valve and solenoids, fuel filter, maf sensor and deep cleaned the throttle body and egr passages. Still, my LTFT is high (2.1 at 29% and 2.2 at 14%).
I ve also changed spark plugs and coils, and cleaned the fuel injectors.
Vehicle is a 2002 Expedition with 196k miles and about 3 years of not being driven constantly (maybe 20 miles a year?). I just decided to give it some love but this one has me baffled.
Did you ever figure it out? having the same issue with a 99 mustang right now....
@@Austin-jm4gr Not sure smoke from IAC is normal from EVAP smoke machine.
Question, 96 f250 7.5l v8:
Have lean on bank 1 and bank 2 (P0171 & P0174). Also it backfires when reved up fast, when taking off from idle it may hesitate for a second, and in the mornings its hard to start or if left for a few hours without being ran. Any ideas? Thank you
Since both banks are having the problem, it could be something that affects the whole engine, such as fuel pressure, vacuum leak, MAF sensor, and so on. Lean or Rich codes can be hard to troubleshoot. Also, backfiring is often a timing-related issue.
@HVAC_Mechanic thank you, I believe it may be the maf sensor although I just replaced it only 2 years ago so I didn't suspect it. I texted it by unplugging while it was running and it only changed idle very slightly but continued to run fine.
You replaced it with what? OEM only for any sensors especially maf If you use cheap Amazon or Chinesium you’re just causing more problems . You have to have a good scan tool to see what is going on or find someone that does and knows how to use it. Good luck with that. You have to verify the problem first. If it is reporting lean just at idle and improves at higher rpm, it is most likely a vacuum leak.
Need help, guys. I changed the fuel filter clean the mass air sensor i also got the code reading p0174 bank2
Any idea what happened?
I replaced map sensor, fuel filter, all 4 02 sensors air filter still same problem. I have come to the conclusion that no one knows how to fix this problem until all parts are replaced.My advice is start with the cheapest parts first,you may get lucky because no one and i mean no one can tell you the exact part to replace no matter what code shows up. I will be changing the egr next.
Lean and Rich codes can be hard to find the problem and fix. It's best to test the components first before replacing them, but in the end, it is whatever works.
Thank you but why would you not do exactly what you did but in reverse. Least expensive and simple to complex?
When it comes to engine Lean and Rich codes, every mechanic will troubleshoot it differently. There is no perfect thing to start with since so many things can cause the codes. I'm just listing the way I do it.
@@HVAC_Mechanic amen.
@@HVAC_Mechanic
Hello i have a 2002 ford e350 xlt v10 lariat. The cel light turned on and obd2 codes are po171 po174 po102 and po460 the van still runs like a champ no hesitation no bogging out at stops nothing like that . runs smooth. When i use the live fee and run the engine i noticed the maf has low to no voltage so i delieve the maf is bad and my air filter is very dirty. I plan on replacing both the maf and filter. Wilk this clear the po102 and the po174 and 171 codes should i also use some lucas fuel injector ckeaner in my gas to clean injectors.also the pcv valve hoses seem to be wrapped with an material that apears to be around the hose with hose clamps and is all cracked. Ive read this is common with the ford e350 engines is the exterior material on the hose cracked or is it the actual hose . can you please tell me. What your professonal opinion is when it throws the 174 171n102 and 460 all together and yet runs well still oh on ocasion there is a whistle sound.
Thanks Selina
Is smoke from IAC normal when using EVAP machine?
Yes, this often happens during an intake smoke test. The IAC is supposed to be open at idle when the throttle plate is closed. It will depend on make and model of the vehicle.
@@HVAC_Mechanic 1998 Ford Explorer 4.0. SOHC
How about lean on both banks p0171 p0174
Looking for places to check I think that narrows it down some
It can be hard to troubleshoot Lean Codes but Lean on both banks would point to something that affects the whole engine.