000665 - Boost Pressure Regulation: Control Range Not Reached

[/dev/null]

For a long time now I have been having an intermittent problem with my PD170. Posted here in the past, been into dealers several times and nobody is any the wiser! Also spoke to a few people on here who have had similar problems and they are in the same boat too.
http://www.seatcupra.net/forums/showthread.php?t=269367

Basically what happens is that now and again the car goes very juddery when idle, almost like regen mode but worse and at 750 revs rather than 1K. The car then has terrible acceleration, pretty much no turbo kicking in until around 2.5K revs at the very least, then it is very jumpy from there onwards. It feels like the car is choking if you get what I mean? Like the power is struggling to get to the wheels!

VAGCOM/VCDS shows no issues and dealer can find nothing. Never have the DPF light on and also checks the levels once when it was doing this and DPF was around 20%.
Then all of a sudden it will stop doing this and work absolutely fine again!!

Anyway, the car was doing its little trick pretty bad yesterday, felt restricted all the time, even at higher revs. Gets onto the motorway, go into 5th as I get to about 50/60 and suddenly coil light flashes and it goes into limp mode. Turn off engine and back on again, and then within a few seconds goes into limp mode again. Does this 4 times, until finally I just kept it in 4th gear then it was ok. It stopped the cruise control from working though!!!
Car drove like a dog for a few miles then all of a sudden, it's fine again (apart from CC not working) - driving perfectly, no loss of power etc. Parks up for an hour or so, come out, drive off and the car is still fine, cruise control working fine now.

Done a VCDS log today and here are the results:

2 Faults Found 
001025 - EGR System: Insufficient Flow 
               P0401 - 006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 26
                    Mileage: 165867 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 21:14:31

             Freeze Frame:
                    RPM: 1920 /min
                    Torque: 64.0 Nm
                    Speed: 46.0 km/h
                        84.63 %
                        95.55 %
                    Mass Air / Rev.: 267.1 mg/str
                    Mass Air / Rev.: 408.8 mg/str

000665 - Boost Pressure Regulation: Control Range Not Reached 
               P0299 - 006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 5
                    Fault Frequency: 4
                    Reset counter: 38
                    Mileage: 166340 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 17:46:20

             Freeze Frame:
                    RPM: 2304 /min
                    Torque: 320.0 Nm
                    Speed: 111.0 km/h
                        70.59 %
                    Voltage: 14.35 V
                    Pressure: 2130.0 mbar
                    Pressure: 1533.6 mbar

Now the EGR flow one is because I have the EGR gasket mod fitted, but the car had the problem well before that - I just fitted it in an attempt to cure this issue!!! (someone suggested it may be EGR related).


I have suspicions it's DPF related but the light never comes on (it definitely works because had it on in the past and also done a manual regen using VCDS and it comes on then). No other fault codes other than the above, and also SEAT garage have never been able to find anything. The car has high mileage however this has been a problem for the last couple of years, just started getting worse recently!

 

[/dev/null]

Also, I found this: http://wiki.ross-tech.com/wiki/index.php/16683/P0299/000665
but without any other error codes, how the hell would I go about finding out what it is!?

16683/P0299/000665 - Boost Pressure Regulation: Control Range Not Reached
Possible Symptoms

Reduced Power Output
Limp Mode

Possible Causes

Hoses/Pipes incorrect connected, disconnected or leaking
Charger Pressure Control defective
Turbocharger faulty
Diverter Valve faulty

Possible Solutions

Check Hoses/Pipes to/between Components
Check / Clean / Replace Charge Pressure Control
Check Turbocharger
Check Diverter Valve

Special Notes

When found in 2.0l TFSI:
Check Boost Pressure Control Valve (N249), for cracked rubber diaphragm. A new/optimized Valve is available under Part # 06H-145-710-D (or newer).
RoW vehicles see: TPI 2016331 for details.
NAR vehicles see: TSB 01-07-70 or 2013392 for details.
If the Turbocharger is faulty due to mechanical / internal problems or the exhaust system is restricted (typically the Catalyst) this fault may be the end result.

I have also had this recently, but the same fault code wasn't thrown up this time which I would expect it to if the two were related:
http://www.seatcupra.net/forums/showthread.php?t=327327

 

[Rosscop2402]

Keep me posted on the outcome please, I have exactly the same prob, but I don't have vagcom. I changed the n75 the other day, because I was lead to believe that it was causing the fault. Bit its still happening.

Do u get the vibrations/noise when the recap drop to 1.5k when u are engine braking?

Changing my n75 valve made mine worse.

Is ur egr/ asv valve ok or does ur car judder when u switch engine off?

 

[/dev/null]

Hi,
No I don't get any vibrations or noise when engine breaking, and also don' t get any juddering when I turn the engine off. I assume the EGR valve is ok because I'm told that it would flag up an error if not.

 

[Rosscop2402]

My fr done this again today. I got some one to rev the car when it was doing it and there is a definate air sucking noise that sound wrong. It seems to come from the airbox area.

Wonder is it has an intermittent boost leak?

I also got oil on my hand from around the turbo area. Don't know if that has anything to do with it or where the oil is coming from.

 

[/dev/null]

Does yours just do it for periods of time randomly then stop for no apparent reason?
I would have thought if a hose was loose or something then it would do it all the time or at least more often, but mine seems to do it for a while then be fine for days before doing it again.

Another thing which is confusing regarding it being related to DPF, I've had it do it right after doing a 50 mile motorway run at 7 in 6th gear - that should be easily enough for passive regen.

 

[Rosscop2402]

It does it randomly. I drove from stirling to lands end and back and it was doing it anytime I came off the motorway.

I drove the car this morning and it felt great, I washed, waxed and hoovered it over a 2.5hr period, toon it for a spin and it drove like a pile of shite.

I recons its an egr valve problem. It seems to do it randomly, when the engine is warm.

My anti shudder valve OS sticking because my engine shudders going off, but I don't know if I should get an egr valve to try it.

It's a DIY job, I've had mine off several times and the throttle body.

 

[/dev/null]

The dealer was adamant that if it was the egr then it would throw up an error code. Maybe it is that though? I didn't fancy spending a fortune for one and fitting if that wasn't the problem though. I replaced the MAF but that didn't help.
On that note, does the problem go away for you when you disconnect the MAF? It did for me but throws us a dash light. I guess it goes into some kind of safety mode when it's done.

 

[Rosscop2402]

I've never removed the maf for this fault, buy ur car will feel diff with it disconnected. I did it to find something else and my car felt great, but I must have left it off too long because the light stayed on for a while after I reconnected it.

I'm pretty sure it would only through up a fault code if the egr motor wasn't moving. If it is still moving but not allowing the correct flow, this could allow the car too much recirculated warm dirty air.

 

[/dev/null]

It didn't feel different, it felt normal again, ie it stopped doing it's stupid thing! I didn't remove it, just unplugged the wire.

Ye. I thought it might be doing that which is why I fitted the EGR gasket mod but that made no difference.

 

[Rosscop2402]

Could be the lambda sensor mucking everything up. I believe thats what controls the egr.

I fitted the gasket, but its for a stutter that everyone has.

My mind is working overdrive on this fault, I've even been looking at egr cooler faults . Ahhhhhhhh.

 

[Bruce1]

Hello Dev...Has anybody checked to see if the car is running rich? If you remember we talked about this before and I have the same problem.

 

[Rosscop2402]

I think its the asv. It is meant to close to let the egr valve recirculate, but is its faulty the car will run like a bag of spanners whilst its trying to open the egr valve..

 

[/dev/null]

Nobody has checked however it has been through several services, MOT's etc. Also, fuel economy is fine.
If the ASV is faulty, surely that would throw up an error code? Also seems strange that if it's trying to OPEN the valve that it would cause a problem because surely that just means less dirty air going through?

 

[Rosscop2402]

Don't know if it throws up an error code. My asv is faulty and I had 1 faulty on my ref sport and it doesn't show any fault lights in the dash.

It was a mechanic on here that mentioned that the asv closes when trying to recirc the egr gases whilst the car is running.

I don't have a spare £200 to replace mine at the moment, so ill have to wait and c.

 

[/dev/null]

Ye, I said to the garage that I wasn't willing to to just throw cash at random things "just in case" that is what's causing it.

 

[Bruce1]

Dev/Ross, as I said your symptoms sound like mine. Had a mechanic friend of mine look over it today and within 20 mins sent me out for a new fuel filter.

Car is now running like a dream. All power restored and no jerking under acceleration. Feels like a new car again.

For the cost of £20 it's well worth trying to see if your car benefits.

I'll keep an eye on it over the next couple of weeks and let you guys know how I get on with it.

 

[Rosscop2402]

Might try that Bruce. **** Tesco fuel has a lot to answer for if the filter is fooked. My car was service by previous owner, but u don't know if the filter had been changed.

 

[Bruce1]

If I remember rightly fuel filter change is every 40K miles. For £20 it won't break the bank to try it.

 

[/dev/null]

I had fuel filter changed a while back in case it was that but it still happened.
I think if it were a blocked filter then it would be doing it all the time. Mine just seems to go into a state where its running like crap then all of a sudden it's fine. That's what made me think DPF regenerate however it does it at 750 revs and when vagcom says DPF isn't even above 20% full.