Nissan Frontier p0171

[@OzMechanics]

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[@kennethfuller7538]

This mechanic really leaves ya hanging with this.........he never pinpoints problem......he just clamps hose for brakes and says "thats it"..........lol.......

[@OzMechanics]

On the video I explain I clamped off the hose the the brake booster. Stating that by isolating the brake booster that’s were the leak is at. Does that help out ?

[@kennethfuller7538]

@@OzMechanics ok....so how did you end up fixing problem?....did you have to replace brake booster?

[@kennethfuller7538]

@@OzMechanics ok....i see you answered my question where someone else asked same question.......prob would of helped confusion if at end you woukd of said.." the brake boister needs to be replaced".....but thanks for your video

[@anthonypolo4788]

@@OzMechanicsget em!

[@popanda5988]

You’re knowledge is incredibly intriguing... I just sometimes come and watch your videos for pure entertainment. You give me so much hope as a fellow Hispanic to be great at my job. Thanks for sharing you’re wonderful knowledge Oz!

[@richardostrowski6420]

Great video and diagnosis. Keep it simple and know what you are looking at/for.

[@Mike-xt2ot]

Excellent walk through on that diagnosis!

[@OzMechanics]

Thanks for watching

[@JansenUpchurch]

What did you do to fix it

[@johnnysautorepairs5263]

Great video! Never saw this test for a lean condition before.

[@OzMechanics]

Just crazy when pressing the brake pedal the numbers jump. Glad you enjoyed the video

[@erwinkudoba3646]

I have that code also had misfire in cylinder 1 I went through three mass airflow sensors and recently changed out the cam shaft sensors. Still shaking like a lawnmower. Still have camshaft sensor codes and p0171 any ideas?

[@jaredcouldron3818]

Did you fix this. If yes how?

[@Tortolo-fs5gx]

Wow cool 😎

[@appelsinnadurai]

Thank you very much.

[@luisbaez88]

Good video.

[@gonzgarr1592]

Hey Oz how is your buddy doing at advance level hope he is fine he put out such good technical videos like you do thanks and be save

[@datboydro2267]

That's my problem was gona change the feul pump but padel feels funny

[@pedropedro2837]

Thank you

[@bearmetal8735]

Check valve would not be a good fix for that? Or is it the booster that makes check valve bad?

[@OzMechanics]

Booster should never leak vacuum. Booster is the issue. Thanks for watching

[@mikeoneill7360]

Did I miss something, what is the defective part?

[@OzMechanics]

Watch again. Brake booster

[@mikeoneill7360]

Oz Mechanics I have never seen this type of diagnosis before, your amazing.

[@HouseCallAutoRepair]

I was even a little confused. Didn't know what you were trying to prove. The comments cleared up that the brake booster was suspect. I'm assuming it was leaking while the pedal was being pressed. Pumping the pedal, the reaction shown would be normal.

[@saulmartinez5872]

So,what was the solution??????

[@OzMechanics]

The brake booster. I explained that in the video

[@mindiseverything5036]

I'm a not very mechanically inclined but is it cause brake booster had a vacuum leak, and that caused fuel trim levels to spike ?

[@OzMechanics]

Yes sr. Once I blocked off the booster fuel trim numbers dropped down.

[@joaquinsandoval7156]

It could also be a bad hose line to the booster

[@OzMechanics]

On other vehicles I could. But in this one it was a brake booster

[@expertsniper1811]

So what's the fix

[@OzMechanics]

Brake booster. As on this test when the brake was applied the fuel trims moved. And when I blocked off the vacuum line to the brake booster the fuel trims didn’t move

[@mikemoses1009]

What did you prove

[@OzMechanics]

Mike on the video I show that the fuel trims are running lean and when I pinch off the line to the brake booster the fuel trims drop. That lets us know that the leak looks like it’s coming from the brake booster. Does that help ?

[@mikemoses1009]

I had one today that was acting the same way after I replaces the crank sensor. Only had the o2 code then had thus code . I.found out what it was the video helped I forgot to plug that vacuum line in there at throttle body 🤣

[@mikemoses1009]

Hey are you any good or have knowledge on tourqe converter line pressure solenoids for 2014 Toyota RAV4's how difficult is it to install

[@TheBigBoysTable]

So what did he change? The line or oxygen sensor? What is the fix?

[@OzMechanics]

New brake booster. While clamping off the hose line we eliminated any vacuum entering the brake booster which was leaking and causing a vacuum leak

[@TheBigBoysTable]

@@OzMechanics thanks I appreciate it

[@ScottishRite]

What's the fix you just diagnosed that we need a new sensor bank 1?

[@OzMechanics]

In the video it explains when I pinch off the brake booster. That was the issue

[@zezu4775]

Press the brake pedal on with engine ON or OFF….

[@OzMechanics]

Engine on to creat vacuum

[@zezu4775]

@@OzMechanics Thank’s

[@Andy-ue3dv]

Did you replace the Brake booster or just the booster’s check valve?

[@OzMechanics]

Brake booster

[@Andy-ue3dv]

@@OzMechanics ended up following your video. For the same code but brake booster wasn’t the issue.

[@mickfernandez9605]

So what it the booster , brakes, or ????

[@OzMechanics]

The brake Booster is the only thing that holds vacuum from the intake. And it was leaking

[@mickfernandez9605]

@Oz Mechanics thank you. I have a 2006 Nissian xterra, and it's giving me both 171 and 174 I replaced one of the cats that was broken so let me check the boster

[@ms.crystal8280]

What is the fix for this?

[@OzMechanics]

It was the brake booster

[@ms.crystal8280]

@@OzMechanics I think this is my issue. Although I do not have a code. Thing runs like crap and gets worse when I push the brake pedal. Thanks for the insight. I will be looking into this.

[@ismarmeskovic]

booster or check valve?

[@luisbaez88]

Booster the check valve is to maintain vacuum in the brake booster when the car is under heavy load and vacuum decrease in the intake.

[@ismarmeskovic]

@@luisbaez88 had similar scenario on ford edge,huge vacuum drop indicates booster faulure,slight one check valve.

[@OzMechanics]

Ismar Meskovic and this had a big drop

[@DylanRabier]

What's going on inside the booster that's causing lean condition when applying brakes? 😀

[@tylerfochtman1578]

Hmm. Makes me wonder. On my 05 pathfinder I have the p0171 bank 1 lean code. Haven't done the brake booster check, seems intriguing. Always felt like I may have messed up something with my brakes when I changed them and never bled them out. Seem to drag a bit. When my car gets hot, or if the ac is on for a while, the short term bank one trims go to 25%

[@joshbrewer9786]

Hey Oz, thanks for the video. When changing the brake booster do you do the master cylinder at the same time or is it fine to put the new power brake booster in and the old master cylinder? I am a contractor not a mechanic but I wanna do this one myself cause it’s easy to get to haha. I have a 2010 Nissan Frontier SE with 90k miles on it and ABS light/VDC OFF light and SLIP light all on with the PO171. I am hoping the Power Brake Booster solves all as no other codes come on that give any idea why all other lights came on same time check engine light did. If you have any thoughts before I do it let me know please. Otherwise I will do the Booster replace and clear codes and check back in here. Thanks Oz!

[@jessecruz8044]

How do you fix that

[@OzMechanics]

In the video I showed that the brake booster was the issue and explained that that was the issue and had to be changed out. Hope that helps

[@jessecruz8044]

It’s something to look at so far fuel pump, and direct fuel injection pump haven’t cleared up the issue. It seems to happen when running the AC. But thanks for the content. I will subscribe and like for sure!!!!

[@caliautotech21]

Nice video brotha! Easy peezy

[@kevinkern3848]

So the fox is a brake booster?

[@OzMechanics]

Booster is the issue. Because as soon as we clamp the brake line our fuel trims drop and go back to normal

[@civy28]

THANK YOUUUUUU!!!!!

[@xjrope]

So just clamp off the hose and it's fixed. Cool!

[@OzMechanics]

If you clamp off the hose the brake pedal will be hard. The fix is to replace the brake booster

[@xjrope]

@@OzMechanics I was being an ass 👍

[@OzMechanics]

Lmao. Hey you never know. CYA!!

[@xjrope]

@@OzMechanics do you happen to know where I can find the ohms range is for an 03 pathfinder fuel sending unit??

[@kingstonsean]

Finally. Replace the brake booster. Why couldn't you say that in the video?

[@billyyoder8171]

Thank you Oz. Good job. Have a blessed and safe week to you and your family.

[@marshalledwards539]

What exactly are you telling us?

[@OzMechanics]

In the video it explains when I press the brakes the fuel trim changed. And when I get the pliers and cap off the brake booster hose we don’t get a change. The fuel trims don’t change anymore. Explaining that the brake booster is the bad part. Did that help ? And what part of the video didn’t you understand?

[@raysno8367]

What was it ?

[@raysno8367]

He didn't say what the actual problem was , do I have to change the brake system

[@OzMechanics]

In the video I say I block off the brake booster. The brake booster is the problem.

[@bwest-yq3uc]

what fixed it

[@OzMechanics]

Hi Lot brake booster

[@misaddude1]

I just got my diagnosis from autozone and got that code.. p0171 so what do i need to replace or how do i fix it??

[@estebanborja873]

I’m wondering the same thing I just got that same code today, dis you fix it?

[@misaddude1]

@@estebanborja873 lol i dont know what to fix

[@HouseCallAutoRepair]

There is no specific fix. Testing MUST be done to determine the source of the leak that CAUSED the P0171. (Usually a vacuum leak BUT can be a bad MAF or an issue with an O2 sensor!)

[@makusensei8330]

Lol I went to autozone too what did you guys end up doing?