Hello,

I searched and done all troubleshooting regarding this error code but with no success.

Checked; DV, N249, N75, all hoses. clamps etc...

I have a friend who works in Forge and K&N dealership, so I`ve borrowed new parts from him, but nothing... low boost won`t go away.

I gave up and drove my vRS to škoda mechanic, they rechecked all valves, intake manifold etc. and said that they are OK.

After a few days they called me and said that the problem could be in clogged CAT and the turbo has changed color, probably overheated.

Is this possible?

P.S; Sorry for my bad english...

Best regards,

Igor

That would explain if the turbo isn't able to spool up properly.

You could get an emissions test done and if it fails then look at taking the cat off and replacing it

Hi Igor

Sorry I can't help with your problem......but welcome to the 17705 club

If they suspected the CAT they should have run it on the diagnostics and found out if it performing properly or not. The Turbo does get very hot during operation which is why the surrounding pipe work is wrapped in heat shielding. They need to see what the boost level is so they can see if it is in limp home mode or if it is an electro/mechanical issue like a stuck n75 or wastegate.

Have you tried the basics like a throttle body clean?

I have this problem over 3 years now, just recently I was aware of this problem. I bought this car from a guy who was using it as a show car, uniroyal tire dealer.

It had only 28000km (real) and it was in excellent condition but from the beginning I suspected than something is wrong, I have expected more from 180HP.

During this 3 years only 2 times the check engine light came on and every time škoda mechanic just erased the error and told me "you should drive this car more on open roads, it is clogged".

I also have Landi Renzo gas system installed and two weeks ago a motor temperature sensor failed so I went to authorized dealer. The mechanic fixed the sensor and took it for a test drive, he told me that something is from with the car, like driving a dead horse....:confused:

Anyway, this error came up also;

16804 P0420 Catalyst System,Bank1 Efficiency Below Threshold

Best regards,

Igor

And now the conclusion ;

Škoda called me today and said that the turbo has failed, if I understand correctly the wastegate doesn`t close something and boost is going directly to exhaust.

They ordered a new turbo so I`m still waiting....

Best regads,

Igor

And now the conclusion ;

Škoda called me today and said that the turbo has failed, if I understand correctly the wastegate doesn`t close something and boost is going directly to exhaust.

They ordered a new turbo so I`m still waiting....

Best regads,

Igor

Woah! New turbo! That'll be expensive then!

If he's saying that the wastegate valve isn't closing, then it could just be that the actuator end link just needs adjusting, to close it. Unless something is broken inside the actuator can, like the spring or rivet on the top end of the rod. Or perhaps the wastegate valve itself has broken up, and taken a trip down your exhaust! That would obviously allow a good percentage of the exhaust gases to permanently bypass the turbine wheel.

Either way the turbo could be reconditioned. Changing the actuator would be easy, and there are plenty of aftermarket actuators about to fit the k03. But if it's the valve itself, then you'd need a new turbine housing really. Not sure where you could source one from.

Because Skoda lack the ability to repair turbos, they will just replace the whole unit, even though it doesn't really need to be done. So that's probably what's happening here.

If they do change it for a new one, make sure they give you the old 'broken' unit back.

They said that it`s beyond repair, i believe them because the mechanic who checked the car is my good friend.

New turbo will cost me around 800 eur or 750 gbp, work included.

How much is in UK?

Best regards,

Igor

They said that it`s beyond repair, i believe them because the mechanic who checked the car is my good friend.

New turbo will cost me around 800 eur or 750 gbp, work included.

How much is in UK?

Best regards,

Igor

New K03 turbo (06A145713D/704T) from BTN is £691, exchange item is £655.

I guess I'm saying it could be saved because I do this on a regular basis! I have an endless supply of new turbo parts at work so I can pretty much rescue anything, within reason!

maybe you should of done a search first . 90% of the time its the throttle body failing .

his my post about it and ive cured it

http://briskoda.net/octavia-i/ive-cured-17705-etc-codes/157524/

A lot of the time it's a software error. If you have checked everything and found no physical problems then it can be mapped out. We can do this with the STS unit, and so can be done worldwide And it's the perfect excuse to get a good remap at the same time..

A lot of the time it's a software error. If you have checked everything and found no physical problems then it can be mapped out. We can do this with the STS unit, and so can be done worldwide And it's the perfect excuse to get a good remap at the same time..

Yeah i've been told this too!!!! everyone just seems to scoff at the 17705 been a gremlin of sorts!

Update;

17705 error is back!! :S

Also this came up; "16804 P0420 Catalyst System,Bank1 Efficiency Below Threshold"

I think that only a 5L of gas and matches will solve my problem.

I will do a boost leak check with a compressor but I need a little guidance:

I read that before the system is pressurized oil cap must be removed and some valve on intake tube.

The hole is plugged but nothing is mentioned what happens with the valve.

Should I plugged it also or what?

Best regards

Edited 6 December, 200916 yr by Gonzaga

I have removed the tube between N249 and DV, while idling I plugged the tube with my finger and felt sucking.

Then my friend pushed it to 5500rpm, I felt nothing.

Is this normal?

Maybe I am mistaking but should this be reversed?

Vacuum created between N249 and DV pulls the membrane in DV and boost is going back to intake, this is how it works?

I have removed the tube between N249 and DV, while idling I plugged the tube with my finger and felt sucking.

Then my friend pushed it to 5500rpm, I felt nothing.

Is this normal?

Maybe I am mistaking but should this be reversed?

Vacuum created between N249 and DV pulls the membrane in DV and boost is going back to intake, this is how it works?

That sounds OK to me...... your unlikley to see any boost by reving the engine to 5500rpm due to no load on engine.

No load = no boost

HTH

I checked yesterday with vag com block 003, 115 and 118.

Requested and actual boost are almost the same and actual boost peaks at 1850mbar which is around 0.8 bar.

Idle MAF value is 2.8 - 3g/s.

I recently remapped ECU to stage 1, according to mechanic should be 210HP and 300Nm of torque.

Is this too low boost for remapped car?

I will check for boost leaks using this tutorial; http://www.a4mods.com/index.php?page=webcontent/pages/boostleak.html

Best regards,