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Author Topic: 1.9 TDi overboosting (P0234)  (Read 1360 times)

Offline SirDavidAlhambra

  • Sir David Alhambra.
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1.9 TDi overboosting (P0234)
« on: May 15, 2019, 09:38:18 PM »
Hello, everyone! This is my first post here, pleased to meet you all.

I have a 2006 1.9 Alhambra (115bhp auto). Lately it’s been going into limp mode a lot, with code P0234 (turbo overboost).

However, it’s not the sticky turbo vane issue causing the problem.

I’ve had the N75 valve changed and a new turbo fitted - but it still goes into limp mode. In particular, it predictably loses power at 80mph if going up a shallow incline, and the “Emissions workshop” light comes on. The car doesn’t have a DPF, so it’s not that.

I did a “freeze frame” the last time it went into limp mode, and it showed the MAP pressure as 2.52 bar. Not sure if that helps, but I’m clutching at straws here.

My usual garages simply have no idea what to do. Any advice or tips would be very much appreciated! Thank you all.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Kristaps Baltais

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Re: 1.9 TDi overboosting (P0234)
« Reply #1 on: May 15, 2019, 09:43:47 PM »
Have you checked  vacum leaks? Not enough vacum can cause turbo fault codes.

Sent from my SM-G960F using Tapatalk

Buying this car after knowing all common problems feels bit sadistic, but then again, my main income is from growing potatoes in arctic.

Online johnnyroper

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Re: 1.9 TDi overboosting (P0234)
« Reply #2 on: May 16, 2019, 09:06:05 AM »
As above check the vac pipes for splits etc,also check the vac output looking at 20+hg vac, while checking that on idle the n75 should be putting roughly the same out to the turbo. I would also be inclined to change map sensor for genuine Bosch one as it could be giving erroneous signals.

Offline Kristaps Baltais

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Re: 1.9 TDi overboosting (P0234)
« Reply #3 on: May 16, 2019, 09:17:26 AM »
EGR could be stuck open and give emissions fault code

Sent from my SM-G960F using Tapatalk

Buying this car after knowing all common problems feels bit sadistic, but then again, my main income is from growing potatoes in arctic.

Offline SirDavidAlhambra

  • Sir David Alhambra.
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Re: 1.9 TDi overboosting (P0234)
« Reply #4 on: May 16, 2019, 02:47:30 PM »
Thank you both... I've not checked for vacuum leaks (I don't know how to) but will book it into a garage to ask them to do that. The pipes generally look fine as far as I can tell from an amateur visual inspection.

Regarding the EGR, I gave it a dose of Wynns EGR cleaner yesterday (that's how bad things have gotten!) and it didn't make any difference at all. I wouldn't have necessarily expected it to fix it, but I thought it might improve it slightly perhaps in which case at least I would know what I'm dealing with.

Out of interest, do you know what the rubber pipe that runs across the back of the engine is? It's about an inch in diameter and has a white fabric sheath over a section of it, near where it runs past the oil filler cap. I believe it even has a little clip to it can be clipped to the engine cover. It basically runs from left to right across the back of the engine and usually sits on top of the rear part of the plastic engine cover.

Thank you again.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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Re: 1.9 TDi overboosting (P0234)
« Reply #5 on: May 16, 2019, 05:21:52 PM »
That sounds like the coolant pipe that goes to drivers side of the egr cooler

Offline Chrispb

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Re: 1.9 TDi overboosting (P0234)
« Reply #6 on: May 17, 2019, 11:22:56 AM »
Was the overboost/limp noticeable straight after or very soon after the new turbo was fitted as the actuator rod adjustment may need tweaking to get the optimum setting.
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline SirDavidAlhambra

  • Sir David Alhambra.
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Re: 1.9 TDi overboosting (P0234)
« Reply #7 on: May 17, 2019, 11:37:37 AM »
Hello Chris, yes the overboost was noticeable very shortly after fitting the new turbo. As soon as I hit 80mph for the first time, the car went into limp. For general driving, it was unnoticeable - the car seemed OK in every regard, although I think it did limp once at about 50mph too. My diagnostic tool showed that the turbo was getting up to 2.52 bar, which I'm told is "far too high"...
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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Re: 1.9 TDi overboosting (P0234)
« Reply #8 on: May 17, 2019, 01:41:36 PM »
Apologies if I misunderstood the original post is the overboost only since new turbo then as I was thinking from original post it was same with other turbo?

Offline SirDavidAlhambra

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Re: 1.9 TDi overboosting (P0234)
« Reply #9 on: May 17, 2019, 02:38:10 PM »
Sorry for lack of clarity in my previous posts... the situation is as follows:

About a month ago, the car started going into limp mode quite often. In fact, it was happening on almost every trip. The speed I was driving at didn't matter; it would go into limp at 10mph, 30mph, 70mph... totally random (but always when accelerating).

As a result, I took it to a garage and they changed the N75 valve and fitted a reconditioned (not second-hand) turbo.

Now, the car doesn't go into limp mode anywhere near as much as it used to... but it does still go into limp at inconvenient times. In particular, it always goes into limp at 80mph. I think it once went into limp at 50mph when accelerating (with the new turbo) too.

So, the problem still exists with the new turbo, but happens less frequently and under seemingly different conditions. A real conundrum! :)
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Chrispb

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  • Region: South East
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Re: 1.9 TDi overboosting (P0234)
« Reply #10 on: May 17, 2019, 03:59:40 PM »
boost pressure needs to be checked around the 3000RPM mark and 100% throttle and maximum boost pressure 2200mbar or 2.2 on your reader.
Trial and error will be needed to get as near to it as you can, lengthening to rod will reduce pressure.
It's not easy due to access and heat if engine hot.
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline SirDavidAlhambra

  • Sir David Alhambra.
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Re: 1.9 TDi overboosting (P0234)
« Reply #11 on: May 22, 2019, 06:51:42 PM »
Quick update for anyone who's interested: So I'm now on my 5th garage looking at it, this latest garage has changed all the vacuum pipes as they thought there was a split in one of the vacuum pipes from the N75, and apparently the fault is still there. Nobody seems to have the foggiest idea what's causing the car to overboost and some of the approaches to diagnosis have been random guesses or 'trial and error' at best. It's really making me lose faith in the car 'repair' industry... it would seem that many of these mechanics are just fine if the car needs new tyres or a new exhaust or suchlike, but anything that involves an actual scientific understanding of how the engine works (i.e. more than just switching parts over until it works again) results in them frankly not having a clue. I even contacted our local diesel tuning people (in the hope that a company that knows how to tune a diesel engine might know something about how turbo systems work) and, despite their national reputation, it turns out that all they basically know how to do is plug a laptop into an OBD2 port and click "go" with the hope that the software will update and the car will go faster as a result... no actual in-depth understanding of the mechanics of how the engine itself actually works. One guy at a so-called "engine repair specialist" couldn't even understand what I meant when I said I changed the MAP sensor... I explained to him three times that by MAP sensor I mean the sensor for the Manifold Absolute Pressure on the air intake pipe yet he still couldn't get it into his head that I had NOT had the car "remapped". As for the local dealer - well all they seem to do is buy cars wholesale, sell finance packages, and do overpriced oil changes.

Will let you know if I ever get any closer to figuring this one out...
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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  • Country: United Kingdom
Re: 1.9 TDi overboosting (P0234)
« Reply #12 on: May 22, 2019, 07:04:23 PM »
I can’t understand why it’s so difficult for them to understand it’s fairly simple system, engine running produces vac,n75 applies full vac to turbo for max boost as boost is reached vac bleeds off and vents to a filter by air box and gradually operates the vnt mechanism to vent exhaust pressure down the exhaust rather than over turbo.


Offline SirDavidAlhambra

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Re: 1.9 TDi overboosting (P0234)
« Reply #13 on: May 22, 2019, 07:17:59 PM »
Indeed. I would have thought that diagnosing an overboost condition would be a matter of scientific diagnosis of the problem. After all, it's a mechanical device that operates according to predictable laws of physics. It would seem however that even all these 'reputable' garages treat it like voodoo science. "Oh, it's overboosting? That's your turbo then mate, best change it". Absolutely no discernment whatsoever, just dumb leaping to (expensive and typically incorrect) conclusions. At least the latest one got as far as thinking about vacuum pipes, but nonetheless the problem has persisted after changing those pipes. I feel like I'm asking them to investigate the origins of the universe, not what I would have thought would be a straightforward mechanical problem. The worst ones are the idiots who want to charge £50 "diagnostic fee" just for reading an OBD2 code and telling you what it says. It's enough to make me just want to scrap the car and walk away from it all!
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline SirDavidAlhambra

  • Sir David Alhambra.
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  • Posts: 568
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  • Spec: 2006 1.9 Tdi auto
  • First Name: Dave
  • Region: South East
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Re: 1.9 TDi overboosting (P0234)
« Reply #14 on: May 22, 2019, 07:45:55 PM »
I forgot to mention the “VW Specialist” by the way who very firmly told me that it was definitely my DPF clogged because the car is used for lots of short journeys. I told him the car doesn’t have a DPF. He told me I was 100% absolutely wrong and that it most certainly IS the DPF being blocked, no doubt about it whatsoever and I don’t know what I’m talking about and should leave it to the pro’s. In the end I just walked away from that one, pretending to be thankful for their wise advice and saying I’d get it booked in with them at some point, and left them a bad review on the net. I’m only slightly surprised he didn’t tell me the fault was with the sunroof (which the car doesn’t have). Clueless doesn’t even start to describe it.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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  • Country: United Kingdom
Re: 1.9 TDi overboosting (P0234)
« Reply #15 on: May 22, 2019, 09:43:37 PM »
Have any of these garages actually got a mitivac out and measured vac output at pump, vac out of n75 to turbo and also manually applied vac at vent actuator to see if it starts moving at 3-5hg vac and reaches max travel at 17-19hg vac? That is basic stuff when trouble shooting an overboost fault. Also has MAF operation been checked on live data?

Also has anyone done a log with diagnostics foot planted from about 1300rpm in 3rd up to red line see what pressure it produces and what n75 is doing to see if it is trying to control boost pressure?

« Last Edit: May 22, 2019, 09:45:44 PM by johnnyroper »

Offline SirDavidAlhambra

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Re: 1.9 TDi overboosting (P0234)
« Reply #16 on: May 24, 2019, 12:25:47 AM »
Well, I think I finally fixed it. I took my car to the breakers yard and just started swapping engine bits over in the hope that I would eventually change something which would make it work again. The man at the breakers yard seemed very relaxed and was fine with me doing that, I guess he was in a good mood because of the nice weather perhaps.

I was prepared to end up swapping the whole dam car over, piece by piece, if that’s what it took.

Anyhow, when I changed the MAF sensor, the overboost stopped but I started getting two other error codes. So I just carried on switching stuff over. When I switched the MAP, the other codes disappeared and the car works fine now. So it looks like the MAF and MAP were both faulty.

So much for all these fancy pants computerised diagnostic tools and so-called specialists. I don’t have a clue what I’m doing but managed to fix it even though the dealer and 4 other garages couldn’t. I don’t even know how doing what I did fixed it. All those bozos could do was suck air through their teeth and tell me I shouldn’t use reconditioned turbos and I needed a “proper” new one because the computer was telling them there was a turbo overboost therefore the turbo must be faulty. If I’d followed their advice, I’d have wasted £1000 on changing a part that was working perfectly ok and I would still have had the same problem.

Anyhoo, there you go. If you get P0234, try changing the MAF and the MAP. No idea how or why that works, but it fixed it for me.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Chrispb

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Re: 1.9 TDi overboosting (P0234)
« Reply #17 on: May 24, 2019, 04:22:20 AM »
Early days yet we'll watch this space
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline SirDavidAlhambra

  • Sir David Alhambra.
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Re: 1.9 TDi overboosting (P0234)
« Reply #18 on: May 24, 2019, 06:59:02 AM »
Yes, sensible advice... part of me is just wondering if the problem has only gone away temporarily because of some fluke such as because it’s been quite warm outside recently. Really I’d like to try it out in cold conditions too. I took it out late last night when the air was cooler but it was still 17C out there and really I’d like to give it a go when it’s closer to 10C. However one thing I know for sure is that the car used to go into limp mode every single time I tried to make it do it, yet now it just won’t go into limp mode no matter how much I try (and, if I say so myself, I seem to have mastered the art of putting my car into limp mode during the past few weeks). Initial indications are therefore good but I do recognise the possibility of a fluke such as accidentally disturbing a wire for the better, change in ambient air temperature, maybe even having just moved a few pipes or hoses around by accident and having bent them in such a way that a split is a bit more sealed now for a while, etc. I will be keeping a very close eye on it over a period of time to see how it all plays out... if it is indeed the MAF and MAP sensors however, then I’ve absolutely zero idea how the MAF could have been causing overboost. Still, as long as it works that’s fine with me!

You guys were very helpful, gave me lots to think about - thank you
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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  • Region: South West
  • Country: United Kingdom
Re: 1.9 TDi overboosting (P0234)
« Reply #19 on: May 24, 2019, 07:29:55 AM »
The maf reads incoming air so if that’s off it can throw everything off.

Offline mike wilson

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Re: 1.9 TDi overboosting (P0234)
« Reply #20 on: May 24, 2019, 08:35:17 AM »
These things often work by their resistance changing as air flows over and cools them.  When they get dirty, they are insulated a bit and think that there is less air flowing to cool them, so the system thinks it has to pass more (overboost) to get the right number.

You _can_ clean them.....

Offline Chrispb

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Re: 1.9 TDi overboosting (P0234)
« Reply #21 on: May 24, 2019, 03:18:37 PM »
You  really need to do a live data log file with VCDS so you can see how the MAF MAP EGR and turbo are performing .
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline SirDavidAlhambra

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Re: 1.9 TDi overboosting (P0234)
« Reply #22 on: May 25, 2019, 07:30:36 AM »
Is VDCS the same as VAG-COM please and can you download it somewhere like you can with the ELMCOM and FORSCAN software for Fords please, thank you. I love being able to tweak hidden settings and suchlike  :)
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Online johnnyroper

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Re: 1.9 TDi overboosting (P0234)
« Reply #23 on: May 25, 2019, 09:16:37 AM »
Vcds is the new version, yes easy to download the lite version and have a play with if you have a KKL lead. Can update to the registered copy and open more options up.

Offline SirDavidAlhambra

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Re: 1.9 TDi overboosting (P0234)
« Reply #24 on: May 25, 2019, 09:36:10 AM »
Thank you very much, that is very helpful.

Do you know please if it would work with the cable that I used to plug my Ford Focus up to the laptop using ELMCOM software?

I very much enjoy using the Ford Focus software because it gave me loads of extra settings and features in my car for free!
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

 

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