P0299 Underboost - N75 Valve Diagnosis and Replacement - VW / Audi / Seat / Skoda

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Welcome back Bluudies to the channel. In this video I finally track down the fault putting my van into limp mode, bring up code P0299 Underboost. I look and test the vacuum side of things in this video, testing the engines vacuum operations, hoses and the N75 valve. The valve cost me £43 delivered for a pierburg OEM one, not the cheaper £20 Ebay ones. That is what ws fitted previously and caused the issues. The vacuum test cost me £11.50 off ebay.
Hope you enjoy the video.
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Опубликовано:

17 дек 2020

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Комментарии : 109

@andyprince8336 Год назад

Great vid pal my van was doing followed your vid on off chance bought the n75 vacuum valve and solved my problem cheers 🥂

@scrakymtb3495 3 года назад

Well done mate fixing this fault . I loved watching this video it was interesting all the vacuum pipes etc 👍

@bluudysgarage 3 года назад

Thanks dude. Glad you enjoyed it.

@RinseRingma 3 года назад

Nice! Well done fixing it!😎 I need to grab myself a vacuum tester, although my ECU throwing errors regarding MAF sensor and egr valve. So I think my under boost problems lies with the egr valve. But first I'll start cleaning the MAF, hopefully it's the MAF or else it's going to be a awful lot of work😅

@bluudysgarage 3 года назад

Egr may need a clean too. Be a good fix if you can just fix it by cleaning. :) good luck

@MrWilliamjohncooper 2 года назад

Hi mate, got the same van with 120k on it, noticed with way making a noise when changing gear, a quick google and the n75 valve came up, swapped for a pierburgh and the vans going great! Pulls like a train up to 90mph! Cleaned the egr tonight which was clogged up, I’d imagine yours will need doing at some point. Keep the vids coming!

@KoKoTAdamzzz 11 месяцев назад

Same haha, it starts making very wierd turbo like noise. my n75 was so rotten i tried changing the hose and the valve literally broke in 2 pieces. Changed it for a new one and issues are gone

@mikedavies4387 3 года назад

Nice good fix glad you got it sorted mate 👍

@bluudysgarage 3 года назад

Thanks Mike. Im glad its finally sorted.

@mikedavies4387 3 года назад

@@bluudysgarage your welcome mate yeah I bet your glad can drive you mad trying to find a fault son got a water leak coming in back some were

@trijetdriver 3 года назад

thank you, your video saved me a bundle!

@bluudysgarage 3 года назад

Thats great!

@ljones396 2 года назад

Thanks for this video man! A week after I ordered a new van for work, my trouble free 2013 T5.1 decided to shit its pants, (I swear they know!) This video has been of great help. 👌🏻🍺

@bluudysgarage 2 года назад

I'm glad :)

@DerGolf2000 3 года назад

Greetings from Denmark. Nice structured style video fixing the underboost. BTW The N75 looks for me like a chinese knockoff with a nice label on it. Real N75 Pierburg valves have some numbers, the Pierburg text and the logo moulded in the housing. But its nice that it works.....

@bluudysgarage 3 года назад

The one I removed was a cheap ebay one. I replaced it with a genuine pierburg one.

@DerGolf2000 3 года назад

@@bluudysgarage I will repeat myself. The one you installed looked fake to me....but as long its works, everything is ok.....

@bluudysgarage 3 года назад

Like I said it was genuine part with paperwork to match.

@PresidentVantage 3 года назад

When you was testing with the pump, was you plugging it into the top part of the valve which goes down to the turbo?

@huwrees1054 9 месяцев назад

Hi, I came across your video, very informative and guidance is great. I have a VW T5 2007 (56 plate) 2.5 TDI LWB with this issue. Trying to find the N75 valve part is a nightmare. I got the vacuum kit and will be doing the testing this evening following your process. One main thing is I do get smoking, along with Limp mode, lag but only the P0299 code. Would you have any references for the N75 valve I could use? TIA

@ScottPC 3 года назад

Good job using the OEM parts, the copies always fail with these N75 valves.

@bluudysgarage 3 года назад

Yeah. Its not like it was expensive really.

@abrahamghannam2137 2 года назад

I have a 2005 Volkswagen Passat TDI first start the car drive drives good take off is eh once the turbo kicks in it takes off sometimes 10 minutes sometimes 15 minutes sometimes five minutes turbo trans off causing the limp mode put the scanner on there was four codes One for the msf One for that n75 I don’t have a vacuum tester but when I shut the car off turn it on for just a second turbo kicks right back on and then after five 10 or 15 minutes goes back in the lint mode what do you suggest n75 Thank you

@deanholliday8186 2 года назад

Hi there. I wonder if you can help. I have an overboost fault and issue that I can’t seem to solve. I’ve replaced the turbo, as the old one was seized, and boost pressure sensor had been changed. But the van continues to flip into limp mode when driving it (up hill or under load mainly). I don’t know what else to try or do. Any help greatly appreciated.

@markwilson9534 Год назад

Hi just watched your video on changing the n75 valve on your T5 finally someone who knows what the noise was after turning my T5 engine off . I've asked loads of people no one ever knew what the noise was mine is a 2010 and been doing it for seems yrs . Just wondering if I can get away with changing the valve and not after mess around with any ECU fault resets

@sas8403 3 года назад

good job where did you buy the pierburg valve one from please do you have a link

@dez945able 2 года назад

But or I think the n 75 valve cannot move the A turbo actuator enough just 1 centimeter. . Do you think if i change n75 would be ok? do you think the turbo actuator should all the way up? when the car start also i didn't find any holes in vacuum pipes any idea what should I or could do thanks and also this came up from computer 19586 - EGR System P3130 -35-10- Regulation Range Exceeded-Intermittent 17964- Charge Pressure Control P1556 -35-10- Negative Deviation-Intermittent

@cherokeebriggs510 3 года назад

Thank you !

@knolez1546 4 месяца назад

Since owning a Volkswagen with a BLS engine I could practically become a VW tech

@pgx452 3 месяца назад

Same with a bhw

@t5jerry 3 года назад

you "bluddy" love making these "bluddy" video`s dont ya 👌👌👌

@bluudysgarage 3 года назад

Sure do :)

@ahmedhussen3617 2 года назад

I got the same issue with my Passat 2.0 TDI and I’ve done exactly what you did changed the same part Peirburg but the issue still the limp mode goes on and still the same fault code P0299..any advice

@mattbonner5281 2 года назад

Just rewatched this as my cars throwing up this code now. But am I right to assume that this fix will only be good for vag group cars as mines a Ford Focus

@HaiderAli-qn2ec Год назад

Will this cause my brake pedal to be stiff the next morning or after a few hours the car is off?

@boolewis9845 2 года назад

hi blundy just bought and fitted n75 valve thanks its working great now . come see me at tatton park vw show this weekend boo's future classics

@bluudysgarage 2 года назад

Thats good. Glad it worked out for you.

@amana1480 2 года назад

Is overboost on a BKD engine always the turbo vanes sticking?

@xAlleeex 2 года назад

Hi, Ive recently brought a t5 2.5 and it has the over boost issue. I've cleaned turbo with oven cleaner and actuator lever moves freely with hand. Only happens when over 2000-2500rpm. Is this down to a faulty n75 valve? Great videos by the way 🙌

@Christopherh28861 2 года назад

Any joy? Mines same just bought an n75 valve mine goes into limp mode mainly in high gears on the motorway and glow plug light come on flashing

@antonybuck2126 Год назад

I replaced n75 on passat.. After testing a lot it seems my valve is constant at full vacuum. All pipes good, everything clean, new valve. Any idea?

@andreagualco9474 Год назад

Hi, thanks for the video. Is it possible to diagnose the N75 valve fault by disconnecting the air-mass sensor plug?

@andreagualco9474 Год назад

@AbsoluteModictsSport

@shanemartin4992 2 года назад

So I’m confused cause shouldn’t you have less vacuum going to the turbo from the n75 on idle and more as your rpms go up to open the vanes. I have a 2006 1.9bew and I have p0299 code smoke like crazy till I go over 50 then goes into a limp mood kinda. I have 20bars of vacuum on idle and then goes down to about 10 when up to 3k rpm

@bluudysgarage 2 года назад

Not it shouldn't. Your losing vaccum. You have a leak or a faulty sensor

@darylmccabe8886 4 месяца назад

Well ive a skoda 2016 ive got the same code there for underboost bug i all so have P13D600 Thats a glow plug with pressure sensor would that cause inder boost

@Parknest 3 года назад

Congrats on fixing Alan. It does pay to use OEM parts.

@bluudysgarage 3 года назад

Thanks man. Sure does.

@GLH8 3 года назад

I’ve got the same vacuum tester. I’ve used it to change brake fluid 😆

@bluudysgarage 3 года назад

Great idea if it works!

@GLH8 3 года назад

@@bluudysgarageThat’s what the pot is for in the kit. Suck the new stuff through, just keep an eye on the reservoir.

@WestYorkshireGuy1 3 года назад

I've got one too. For the brakes. Wasn't impressed so got the reservoir pump. Not a waste of money now I have been given a new use for it.

@marksquire232 2 года назад

Have you got a link for that creative code reader please 😇

@jamestyrrell2225 3 года назад

Hi mate similar issues with my 08 caddy, 1.9tdi pd105 BLS code. Mines intermittent, fine for miles in 5th on the motorway then all of s sudden stops boosting, if I floor it all the time it doesn't do it. It's only low rpm when engine is probably under load. Turn the engine off and on again and it's fine. Would you suggest a new n75 valve or try the Mr muscle job? I've been using loads of fuel additive s and one where you spray it into the induction hose after the maf but still no joy. The vans booked in for a pd130 swap with hybrid turbo but I need s cheap and easy fix until my engine swap has been done. Thanks!

@Mac_F87 10 месяцев назад

Did you ever get to the bottom of your issue? Sounds a lot like the issue I’m having on my BLS Caddy. I get no fault codes even when it’s in limp mode.

@jamestyrrell2225 10 месяцев назад

@@Mac_F87 yes mate the n75 valve was blocked/had no pressure. The engine threw a rod in the end but when I was changing it for a bkd 2.0 and the turbo and n75 could've done with being changed

@Mac_F87 10 месяцев назад

@@jamestyrrell2225 ah right I'll buy a new N75 then. I'll try that before going to the trouble of taking the turbo off and cleaning the VNT etc. I'm concidering doing the con rod bearings and bolts on mine to stop it throwing a rod in the future.

@Mac_F87 10 месяцев назад

@@jamestyrrell2225 after checking vacuum from the tandem pump, doing and output test on the N75 while connected to my vacuum gauge and doing and output test while everything was connected as normal it turns out it was my VNT actuator that’s faulty. The rod was only moving 5mm or so while doing the output test.

@aymenmimoun8805 2 года назад

Hi i need help i change n75 and test and it good but still not open?

@reddave8628 3 года назад

Your videos are sooooo much better to watch when you don't keep doing them silly voices you do 👍👍

@bluudysgarage 3 года назад

Not sure which voices you mean... but I am who I am.

@bretsimpson9890 3 года назад

👍👍👍

@andysmorgen 2 года назад

@@bluudysgarage the silly voices rock dude !!! great content

@mcjjordan 3 года назад

Is this whats referred to as the ‘moo’ valve due to the noise they can make when turning off engine?

@bluudysgarage 3 года назад

It sure is.

@HaiderAli-qn2ec Год назад

Do u know if audi a6 c7 has this part?

@bobbystone8089 3 года назад

How long has it took you to get a new N75 valve from buying the van. Surly it don’t take weeks n weeks to find that out ??

@bluudysgarage 3 года назад

Videos are staggered out. So not as long as the timeliness on youtube. But I bought the van as a camper project not as a daily driver. So most of the time is spent just sitting on the drive.

@hammeredhemi1223 Год назад

My crafter (Named Hitters Revenge) threw up the same codes and performed exactly how your did under load it just goes into limp mode. changed the N75 and no difference so the investigation continues

@satbilla9291 2 года назад

It’s this the same for overboost?

@alanparkinson5724 3 года назад

Top name for the van lol

@bluudysgarage 3 года назад

Lol

@HaiderAli-qn2ec Год назад

Do u know if audi a6 c7 has this?

@michellesaxby669 3 года назад

I got the same problem on my t5 bi turbo all was fine then it dropped a vave put a recon engine and new turbo in and now got that same code and problem not even vw no wots up with it

@bretsimpson9890 3 года назад

Did u fix it I am a vw specialist but I’m south Scotland

@antonnarnickis6675 3 года назад

Same story, recon engine new turbo, and same issue :(

@DIYNORTHERNER 2 года назад

Did you figure out what it was? I have a t5 bitdi with the same limp mode crap going on

@bectasiuneraikens2997 3 года назад

Anybody knows how to disassembly this kind of n75 ?

@skywalker2643 3 года назад

I have a 1.6 tdi Skoda and I have the exact same code exact same problems (when limp mode occurs etc) I changed this part and limp mode still happens in 5th gear where should I look now ? I took to a garage and they tried telling me my turbo has gone but I know it hasn’t

@bluudysgarage 3 года назад

If your turbo is working in the other gears then its most likely not that. If its happening when in your higher gears then its when your engines creating maximum boost pressure for a longer period of time. Id be checking for vaccum leaks on the accurate pipe work or splits in the intercooler or pipework.

@skywalker2643 3 года назад

@@bluudysgarage great thank you for your help 👍🏾

@dale-fi1fi 3 года назад

they will always say turbo everytime because they cba just look into the problem because its not an expensive fix an a new turbo they fitted will rack up a bigger bill for them

@WestYorkshireGuy1 3 года назад

It's also called the boost control solenoid.

@bluudysgarage 3 года назад

Its a N75 valve in the vag community also known as a moo valve.

@WestYorkshireGuy1 3 года назад

German efficiency for you, using numbers instead of names. Lol.

@bluudysgarage 3 года назад

Yeah sounds about right.

@jezlucas3878 Месяц назад

Would it be possible n75 could be faulty without a code

@TheShinyShow 3 года назад

Is the camera recording 60hz? Our electric is 50hz so maybe that

@bluudysgarage 3 года назад

It sure was and we are. This has been sorted and any new videos I've filmed since dont flicker :)

@flippy9133 3 года назад

Haha i knew it 😀

@karlossmith3714 9 месяцев назад

You telling us what issue it had is like you was describing my van lol. Did the coil light flash by any chance?

@bluudysgarage 9 месяцев назад

No afraid not.

@karlossmith3714 9 месяцев назад

@@bluudysgarage I changed my abs sensors as 2 of them wasn’t working and it doesn’t go into limp mode as often now. I have just ordered the solenoid though hoping it’ll help my turbo lag

@webpro607 4 месяца назад

Can N75 fail without any error codes?

@chriswatts6161 3 года назад

Hi where can I get a OEM n75 valve please apart from VW dealer

@bluudysgarage 3 года назад

It is possible to get them online just make sure pierburg valve.

@chriswatts6161 3 года назад

@@bluudysgarage thanks for your reply 👍

@larryking8439 4 месяца назад

I got The same p0299 but i hear noise grom The smak.turbo

@Christopherh28861 5 месяцев назад

Did this completely get rid of the P0299 fault?

@bluudysgarage 5 месяцев назад

Yes as this was the fault on the van.

@Christopherh28861 5 месяцев назад

Thanks changed mine done all sorts just won’t stop throwing the underboost code up😢

@clx5788 8 месяцев назад

4.4 benzin

@MrJoaoMsousa 3 года назад

You damaged it with mr cleaner right? Lame problems from corrosive products inside vacuum circuits

@bluudysgarage 3 года назад

Not at all. Fault was there before and after. Not sure how you think the cleaner can get inside the vaccum system.. hahaha

@MrJoaoMsousa 3 года назад

@@bluudysgarage just asking if there is any relation. Thank you

@bluudysgarage 3 года назад

Yeah no problem. No it can't get into the other system from the exhaust.

@AndersMcTee 2 года назад

Bellend

@jonbraid2520 3 года назад

These things are absolutely terrible vehicles, mine costs £4k+ per year in maintenance and can't get 4 months before it lets me down monumentally so bad I have to have a spare vehicle for when I fails. I've wanted to sell it for years but everytime I fix it something else fails. VW are a joke. Do not buy one, actually buy mine its a 2011 it's had almost every single mechanical part replaced Including: engine, gearbox, turbo, intercooler, clutch, clutch bearings X2, all suspension, Egr, dpf, power steering pump, clutch, flywheel, brake calipers, top mounts, drop links, alternator, all wheel bearing hubs twice, discs pads, tons of tyres, water pumps, cambelt, window switches, fan blower resistor, it's non stop I've had 8 drop links in 4.5 years. £12k if anyone wants it, I only do 6-8k per year too!!!!! Always used with shell vmax diesel.