P0299 - 006 - ControlRange Not Reached - Intermittent

**nick.king** · 02-06-2020,10:32 AM

Morning guys,

Car is still in the garage (was caught up during lockdown), they are re-opening and I've spoken to them about switching the inlet manifold for the non-plastic version. Is there a guide for this or is it a straight swap out?

Many thanks,

Nick.

**nick.king** · 16-06-2020,04:38 PM

Afternoon everyone,

Car still throwing error P0299 (underboost condition).

It's got a new turbo and had the intake/inlet manifold changed for the metal version (lower end performance is a little better since this was done), 5 mins in to my test drive on a slight incline it threw the error and went in to limp mode again.

It's currently running with several other new parts on there, throttle body, MAF sensor etc. (I've asked for a full list)

Not sure if it's worth changing all the pipework, not even sure how much something like that would cost.

Looking for suggestions again if anyone can assist.

Thanks.

**Crasher** · 16-06-2020,06:56 PM

Does your garage have boost system charge pressurisation or smoke testing equipment? However, under boost is nearly always a leak in the vacuum control system.

**nick.king** · 16-06-2020,10:19 PM

Hi, they have borrowed a smoke tester for tomorrow, I think he said Mityvac (not sure if that's the correct spelling).

They have checked the hoses several times but don't think they've smoke tested it.

**Crasher** · 16-06-2020,11:10 PM

They need to smoke test the charge air system at no more than 0.5Bar from the pipe after the air mass meter. There will be the odd tail of vapour, you are looking for something more obvious. You could also use the smoke machine on the vacuum system and that needs to be perfectly vapour tight or use a Mity Vac in vacuum mode to pull a vacuum on the servo to tandem pump hose and it needs to pull upto max on the gauge and stay there.

**nick.king** · 17-06-2020,10:28 AM

Thanks mate, I've passed that information on just in case.

**nick.king** · 30-06-2020,09:52 AM

Originally Posted by Crasher

They need to smoke test the charge air system at no more than 0.5Bar from the pipe after the air mass meter. There will be the odd tail of vapour, you are looking for something more obvious. You could also use the smoke machine on the vacuum system and that needs to be perfectly vapour tight or use a Mity Vac in vacuum mode to pull a vacuum on the servo to tandem pump hose and it needs to pull upto max on the gauge and stay there.

Morning, they've finally got around to smoke testing and just had news that the the smoke test / mityvac results were negative, no issues found there.

Running out of ideas now, got a fresh pair of eyes on it today to see if anything was missed.

Do you have any other suggestions?

The last time I drove it the bottom end seemed better but nowhere near as good as it should be, as soon as I started to climb a hill then it went in to limp mode with error P0299 (underboost condition), the garage have test driven it as well and said it sometimes gives an overboost error as well.

Many thanks,

Nick.

**Crasher** · 30-06-2020,11:28 AM

I will read back from the beginning and see if I can think of anything.

**DMitch16** · 30-06-2020,08:32 PM

Anything useful in this older thread?

P0299 - 006 - Control Range Not Reached - Intermittent B6 Passat - Page 3

Seems like the OP in the above thread spent a large amount of money before the smaller independent got to the bottom of the issue and resolved it.

Incidentally Nick King posted at the end of the above thread but have all the various possibilities mentioned been tried?

**nick.king** · 30-06-2020,08:44 PM

Originally Posted by DMitch16

Anything useful in this older thread?

P0299 - 006 - Control Range Not Reached - Intermittent B6 Passat - Page 3

Seems like the OP in the above thread spent a large amount of money before the smaller independent got to the bottom of the issue and resolved it.

Incidentally Nick King posted at the end of the above thread but have all the various possibilities mentioned been tried?

Cheers Mitch I'll have another read through, DPF stood out immediately though when I clicked the link and they've had the DPF off and run the car without it. This was before they switched the plastic inlet manifold for the metal version, I'll suggest it again though and anything else on that thread they might not have tried.