Sorry to be bringing up this topic again,

17705 - Pressure Drop betw. Turbo and Throttle Valve

17545 - Long Term Fuel Trim Add.Fuel (Bank 1) System too Rich

A good few people seemed to have experienced one or both or these codes, in my case I have both. I know there has been a lot of discussion in many posts and a lot have said it can be the MAF, DV or N75 valve but on reading some of the various posts it seems like some people have tried what has been suggested but the fault code still persists. Has anyone had the problem cured or had the dealer cure it. Don't get me wrong I'm not doubting what people are saying but it just doesn't seem to have worked for those who've tried it.

I noticed I had the 17705 fault a couple of months after buying the car (it was a demo so could have always been on it) the dealer did eventually change the MAF & the cable connectors from silver to gold but in my case this didn't cure the problem. Now 2.5 years and 30K miles after buying it I still have the 17705 fault and have recently discovered the 17545 fault. I haven't changed any parts myself, as I'd rather leave it to the dealer. Also due to the fault being on the car when under warranty I think its only fair they should rectify it now, even though it's out of warranty

The only noticable things I find with the car are,

- initially, but not as noticable now was the sudden drop in power when taking off at around 2500 rpm.

- Sometimes when the car is idling the revs are very erratic, to a point where sometimes I think the car is going to cut out. When stopped at traffic lights the revs jump up and down between 800-1300rpm without touching the accelerator. It feels as if the car is struggling to stay running. (Has anyone else found this)

- The fuel consumption seems to be worse in the last couple of weeks

Could the 17545 code be related to the 17705 one ie degrading of the part over time has caused the new one ?

Mine is booked in for a service which will include getting them to look at the fault codes. The reason I brought this up again is that I think (maybe others feel differently) that its pointless changing out parts which others have found not to cure the problem. Maybe someone on the inside could do a bit of digging around to see what they could come up with ? (if they don't want to post info about it then they could PM me)

Other posts on the topic,

Engine management codes

I'm back but having car trouble

Running problems on RS

Since before my last service I have been getting error code 17705 (Pressure drop between turbo and throttle valve P1297

Same probs here....

Had all sorts replaced, airbox, inlet pipes, throttle body (x2) lambda, MAF, EGR valve, dump valve (x2) - going in again tomorrow for another go - will get them to check that pipe (06A 145 790C)

(just spoke to them, they have the part in stock and will swap it for me)

Make sure they put the clip on the right way round. The monkeys who'd done mine put it on the wrong way round and I've just had to drive 60 miles up the A1 with no boost.

Clip goes on from top of engine to bottom, not from bottom of engine up.

Good job Jon!

What led you to check this pipe in the first place?

Hi John,Any chance of either a picture or some sort of diagram to show roughly where this pipe is located ? and when you say the new ones are different,do you know an approx date when they changed them ? sorry to be a pain but i like Gaff have had this fault for a while and would like to get it fixed asap,thanks ps do you know what the solenoid part number is or what it does (the one your mechanic friend has had problems with) cheers

Dropped mine off this morning, will report back as soon as I know anything.

Jon - considering this is an intermittant fault and you say "and I've just had to drive 60 miles up the A1 with no boost" - what leads you to think it's the final solution? How many miles have you done since they sorted it?

279

I had the same problem. No DTC because it went out from one side only, but I knew that something is wrong....

Here is a picture; it is clearly a boost leak

You can reach it if you go under the car... a heat isolator (not shown in the picture) covers it. The original part on my 2002 RS was 06A 145 790A; it was replaced by 06A 145 790C

Mircea

Same here, but your clip is on the wrong way round and may pop off. It needs to be rotated round the pipe by 180 degrees ie it comes down from the top rather than being pushed on from below.

I took the picture before I get out the clip, so it is exactly how it came from the factory

Thanks everyone for the information.

Jon,

Did you find any noticable difference which led you to think there was a problem with the car in the first place or was it just by hooking up the Vag Com you realised you had the faults ?

When you changed the various parts eg MAF DV, how long or what kind of driving did it take for the fault to re-appear.

17705 (Pressure drop between turbo and throttle valve P1297

Checking ETKA, 06A 145 790C is a pressure pipe in the charge air cooler system. As far as I can see, it is the middle of 5 pipes/hoses between the turbo and the charge air coooler (ie intercooler). (The price is

Guys,

Sorry to ask a stupid question but how far from the front bumper is the hose located and is it in the middle, drivers or passangers side. I'm not familiar with the various car parts which have been used to describe the location of it and I don't have stands to put the car up on to get a good look at it, I was going to park one side up on the kerb to give me enough room to slide under for a look. I know someone mentioned that there was a shield covering it, is this hard to remove. What feature on the photo show it was leaking, it it the dampness on the pipe, is this oil/water ?

Should there be excess oil under the engine, I put my hand on on some parts under the engine yesterday and my hand was covered in oil.

It was mentioned that Mircea clip was the wrong way around, is it possible that it was an issue with the factory as I think this fault is on mine since it was a few months old.

Sorry again for the stupid questions.

Thanks.

Guys' date='

What feature on the photo show it was leaking, it it the dampness on the pipe, is this oil/water ?

Thanks.[/quote']

Gaff,

AIUI, this pipe is somewhere in the pressurised air circuit between the turbocharger, the intercooler, and the inlet manifold - so there won't be any obvious signs of leakage (no oil or water coming out - just air).

I don't know where on the system it sits (from turbo to intercooler; from intercooler to inlet manifold), so can't help you there. Sorry.

Sits between turbo and intercooler. You have a right angle bit of hose that comes up from the turbo and connects to a 3" pipe that runs along the back/top of the engine (pipe from that goes to the DV). It then goes down toward the pancake pipe that sits in the osf front wheel arch. The pipe in question sits between the pancake pipe and the one that goes over the top of the back of the engine.

I noticed mine as I was taking the sump guard off. The pipe was all covered in oil.

I had a quick look at mine this weekend and the pipe comes from the turbo outlet side and joins to the metal pipe that runs under the chassis leg to the intercooler at the drivers side of the car and as was mentioned earlier it has a heatproof cover over it which is just press studded over it,when this is removed you will be able to see what was shown in the picture earlier,there can be traces of oil at the join if it is leaking but i found that the pipe on mine is dry and secure and the clip is the correct way around,Doh! i was beaten to it but i dont know how to remove my post,sorry

Does anybody know if its possible to do some sort of pressure test on turbo system to find a leak because i checked all the pipe connections i could see for security and they all seem fine and dry,i also had a look round the intercooler and cleaned the map sensor out,but i suppose its hard to see or hear a leak if its not under load so thats why i wondered if a dealer can do a pressure test to see if airs escaping.

TaviaRS,

Would the oil thats on the pipe have come as a result of the leak, if so what is actually going through the pipe, I assumed it was air ? Or has the oil come from somewhere else and deposited on it?

I would think its just air that is running through the boost pipes but you do get a little bit oil in the system which is presumably from the turbo which has an oil feed into it,so i dont think theres anything to worry about,

I have followed this thread with interest. My problem has now returned with the cold weather. This morning my car would not accelerate as willingly as it should have.

The problem is when I push the accelerator hard there is a bit of a surge, and then it dies off. If I lift off, then the car accelerates better. Could this be related to the MAF sensor?

It

No problem this morning on the way to work. Will have it checked out at the dealers for error codes.

Guys, I had a look at my pipe over the weekend and from the photo it looks like it is leaking. Question. Why is there oil in this pipe I assumed it would be just air.

Leaking Pipe

Leaking Pipe

Pipe cover

Pipe Cover

touch wood mine has been fine since it came back, that pipe was replaced and also the air pipe leading to throttle body, apparently VAG have revised the design to seal better.

Ian, where did you take your car to have it sorted?