hi there,was wondering if anyone knows what sensor this code is related to 17705 P1297035 ? had a friend plug the vag computer into my 02 octavia vrs and this code was stored,code was erased and i drove round the block and fault code was back. my friend is unable to check what it is until monday, it is not bringing the warning light on so is it still ok to drive ? hopefully its not serious but it does seem to be holding back when accelerating. cheers

17705- compressor-throttle valve connection (pressure) drop remedy check all hose connections i have never had this fault and pressume it's to do with the turbo pressure valve (n75?)

thanks for letting me know the fault,i will get it booked in at the garage and get them to check it over,i thought it wasnt boosting properley and after reading previous threads about the N75 valve,i thought it could be a possibility,either that or the pipes collapsing. thanks again

dsmithmobile,

Will you let me know if you get this problem sorted as I have had this since I bought the car (2 years ago) and it hasn't been sorted out yet, not that they seem interested in troubleshooting it.

http://www.briskoda.net/forums/showthread.php?t=2837&highlight=FAULT+CODE

When I was in the garage getting the coil packs done the same code was on it again.

One of my regular codes, along with 17608 I think...

Seemed to be resolved by replacing throttle body (after replacing many other parts) but then came back after 6mths.

Throttle body replaced again but this time did not resolve, looking at it again on thursday.

(occasional loss of power, reset ign and all restored)

One of my regular codes' date=' along with 17608 I think...

Seemed to be resolved by replacing throttle body (after replacing many other parts) but then came back after 6mths.

Throttle body replaced again but this time did not resolve, looking at it again on thursday.

(occasional loss of power, reset ign and all restored)[/quote']

Your car in Horners Manchester on thurs?... may see you in there then

Guys,

Sorry for stupid questions, Ive seen so many references to these now that I'm not sure which is which.

Is the turbo pressure valve (n75?) the same thing as a DV ?

Is the DV a diverted valve or dump valve ?

Guys' date='

Sorry for stupid questions, Ive seen so many references to these now that I'm not sure which is which.

Is the turbo pressure valve (n75?) the same thing as a DV ?

Is the DV a diverted valve or dump valve ?[/quote']

Not a stupid question

This diagram might help http://klb.briskoda.net/pix/tech/pictures/blockdiagram.jpg (it's actually a block diagram of a Diamond Star turbo engine, but the differences are very small)

The N75 valve is labelled in this diagram as the "wastegate actuator". It controls the opening of the wastegate, and consequently the boost pressure.

The DV (diverter valve) - labelled as "BOV" in the diagram - relieves back pressure on the turbo when the throttle is closed, preventing turbo stall and allowing faster spool-up. It is not the same as an atmospheric blow off valve; air is recirculated back to just upstream of the turbo. This ensures that the mass airflow sensor (MAS) measures the true volume of air going into the engine (which wouldn't happen if some of it was vented to atmosphere by a BOV).

Did anyone actually try changing the DV like Jon said?

It seems he is the only one who has experience this and successfully cured the fault.

From VAG-COM:

"17705: Pressure drop between Turbo and throttle valve (check DV!) 35-00"

Its the dump valve.

my car goes into barkers of hull on friday morning to have the problem checked and hopefully all will be cured,dont know if the dealer is any good or if there techies know of the problem but i did point the service manager in the right direction and mentioned that you guys had suggested that the dv or N75 valve may be the problem because a few of you have experienced this and these parts where usually to blame,fingers crossed they will sort it because i notice that a few people have been back and forth to the dealers a few times before they actually got there car sorted,i will let you know the outcome,thanks for your help guys

hi there, i just thought i would let you know that after taking my car to the dealers today, i am still no better off,the technicians didnt seem to know there a**e from there elbow and they had never heard of the N75 valve and the guy even had to get his manual to see what it was (inspires you with confidence) and even said that it could be the boost gauge that was causing the problem even though it was fitted after getting this problem and that it was connected into the fuel pressure regulator and nowhere near any boost pipes but i told them to disconnect if they wanted to eliminate the problem but they said they couldnt so i had to go back to the dealers in my lunch break to disconnect it for them,went to collect car at 5 o clock and was told that although they have seen the car develop the 17705 code they cannot find what is wrong and that everything is working within its tolerances so they cannot change any parts untill something completely fails so they have told me to take it back again for them to have a better look at it even though theyve had it all day, not happy

Please, please, please don't take this the wrong way, I'm just trying to make my earlier post a tad more understandable:

17705: Pressure drop between Turbo and throttle valve (check DV!) 35-00

i understood what you meant but i took it to the dealer because its still under warranty and they have allegedly checked these parts because i told them that i had been informed that the N75 or DV could be the problem but they are reluctant to do anything about it i just thought i would let them rectify it but if i have to pay for it then i will but i just thought that the main dealers would have the ability to sort it out for me but it goes to show that you guys know more than them,i apologise if it seems like im ignoring your advice but i assure you im not,it is greatly received and i just wish the dealer would listen to me when i pass on your information,thanks again

dsmithmobile

If I were you, I would take your car along to another dealer. it sounds like the 1st one does not understand turbo engines. Your DV is definately leaking, maybe only a little, but enough to generate the code.

Or spend

Or spend

dsmith,

OK, its coming up with the fault, you and I and everyone else knows what it is - your dealer doesn't.

OK, fine, you can live with it BUT if you start getting a honking type noise (sort of like blowing over the top of a milkbottle) GET IT CHANGED Failure to do so will result in at the very least a blown turbo and in extreme cases a blown engine (as the impellers decide to exit either via the engine or the exhaust).

I personally would either find another dealer (pref. competent) or insist that they change the DV, even if its as a precaution. The DV only costs about

thanks guys, i think i will have to travel to another dealer or i might go back to my local one and get a bit shirty with them and see if they will change it rather than cause a fuss,but if they are prone to failing then i might be worth my while to just just upgrade it because i want a remap asap and an upgraded dv may cope better,im still thinking about changing the N75 valve(just want to put my mind at rest that its ok),any idea of there price ? ps thanks for the offer of a dv to try tavia rs but i might as well buy one if it comes down to it and forget about earlier because i understand you probably feel like your wasting your time trying to help people sometimes

If you go back to the same dealer, tell them you've been told what the problem is, and what they need to do to fix it.

If they don't play ball, contact Skoda UK customer services, cos this shower sound like they couldn't fix a skateboard, never mind a car.

Or spend

Sorry just pointing out all the options.

I know the car is still under warranty, doesnt stop people modding cars does it.

From the general tone of the post I got the impression he didnt want to take it back to the dealer as he had lost faith in them. The alternatives is then to ask the people that know (Briskoda members) and people in the trade outside the dealer network (like AmD. Jabba, Revo or whoever).

And it would make a lovely christmas pressie

P.s I am not a saleman, im not on comission, makes no difference to me how many if any DV's we sell. If I post up a deal or an option for someone it is only to benifit them.

From VAG-COM:

"17705: Pressure drop between Turbo and throttle valve (check DV!) 35-00"

Its the dump valve.

IIRC, in another thread you (or was it someone else?) pointed out that only VAG-COM has the helpful clue "check DV!" - the ordinary VAG 1552 used by a dealer doesn't.

If this is the case, then:-

dsmith, you might want to print out this thread show it to your dealer - it might help persuade them to change the DV.

Guys,

I'm not trying to doubt the information that the DV is the problem, I'm just wondering why when my car has had the fault code on it the garage cleared it, brought it for a drive and then put the diagnostics on it again, but the code would not be on it after the drive. Can anyone think of a reasons for this. I would have though that if the DV was damaged then it would appear again after the drive.

Could it be possible that it may one occur when cold ?

Me thinks these garages rely far too much on their computer-diagnostic tools. Bet an experienced turbo techie would have spotted a leaky dump valve in seconds using a very precise, elegantly engineered tool - his ear!