P0299 - 006 - ControlRange Not Reached - Intermittent

[nick.king]

I've passed all the info on to the garage and it appears they've done it all already, really stumped with this one and open to any suggestions :-)

"it’s already had a cleaner through it as one of first things we’ve done. The diff press sensor has been tested already ����*♂️ we’re going to double do everything sensor wise and also put another cleaner through ������*♂️"

Edit: just had a call, taking the DPF to get it cleaned properly as all the readings suggest it's that.

[Crasher]

I thought it had been cleaned properly already?

[nick.king]

I thought it had been cleaned properly already?

They put a cleaner through it but I guess it's that badly blocked it hasn't done anything to clear it.

[Crasher]

Putting a cleaner in is about as much use as ******* in the fuel filler... perhaps that would be more useful.

[nick.king]

Putting a cleaner in is about as much use as ******* in the fuel filler... perhaps that would be more useful.

haha yeah I get that impression, if it can't be properly cleaned then the alternative is something like this VW PASSAT 2008 2.0 TDI 170bhp DIESEL PARTICULATE FILTER DPF - BRM done 30.000 | eBay rather than forking out for a brand new one or possibly Darkside Developments - DPF Delete Downpipe for PD170 / PPD170 - BMN and BMR 2.0 TDi 16v

[Crasher]

Don’t bring in DPF delete pipes into this or else I could get grumpy...

[nick.king]

Don’t bring in DPF delete pipes into this or else I could get grumpy...

Morning, no need to be grumpy I did the right thing :-)

Just thought I'd update in case anyone came across this thread and had a similar issue, the DPF had partially collapsed so I've had it replaced with a brand new one. I decided against both a 2nd hand DPF and deleting it entirely.

In short I've had the turbo replaced (that was shot), the split plastic intake/inlet manifold swapped for the metal version (I have a PDF guide on how to do this if anyone is considering it) and the DPF and related sensors replaced. It wasn't cheap, but it was worth it. It's currently running with a new EGR valve and throttle body but will be swapping back to the originals later in the week.

I honestly can't remember the last time it had the power it has now, it's like driving a brand new car.

Thank you everyone for your comments and suggestions, got there in the end.

[Crasher]

the DPF had partially collapsed so I've had it replaced with a brand new one

which make did they fit?

[nick.king]

which make did they fit?

Hi, sorry didn't know you'd posted again, I'm told the part is OEM.

[B@rnstormer]

Thanks for this thread and for all the updates, including the eventual fix. I have similar sounding issues:

Limp mode if under load like driving up a hill or accelerating hard to join a motorway etc.
Fault code for DPF differential sensor so I replaced and adapted it.
Fault code P0299 for low boost.
Computer keeps trying to regen the DPF all the time even after long motorway drives and fans always on and baking hot when we get home.
Really bad mpg, I guess because of the DPF regen attempts.
Low rumbling sound like the exhaust is blowing especially when driving around town and backing off the accelerator.
What appears to be a leak of exhaust from the V-band clamp between the turbo and the DPF, I can smell exhaust in the car and under the bonnet and I see a small puff of smoke in the area of the turbo when starting from cold (could this be the cause of it all?)

I think pretty much all of those things were mentioned in this thread so sounds pretty similar to me. I see repeated mention of a vacuum leak being a likely cause when P0299 happens (although I see that it ultimately wasn't for yours). I've tested my actuator on the turbo and it moves, and it holds vacuum ok. An output test on the N75 was successful as I could see the actuator moving in and out every few seconds, so I think the vacuum side of things is probably all ok (unless you think it could still be an issue?).

So it sounds like I'm pretty much in the same boat as you were last year, and the thread's pointing me (I hope) in the right direction.

Cheers!

B@rnstormer