Vw t6 cxfa p0299

C

Chubby

New Member
Hi I am wondering if anyone can help
I have vw t6 cxfa engine dsg
I have had a few problems with eml on
Different codes. Had loss of power. P2279 Air intake leak detected, and p13d6 cylinder 3 inplausible pressure signal.
I did smoke test. No leaks present.
So changed air flow meter. Genuine
the glow plug was changed 7 months ago along with the other 3. Genuine parts it felt better. But not 100% but didn't give me any codes. Untill I done long distance approx 100 miles. P0299 turbo underboost.
I have also checked both the egr pipes front and back. Rear one was changed last year. No leaks here either re tested with smoke machine. No visable leaks.
Is there any thing I am missing.
Or is it just a faulty turbo.
Thanks
 
I would start by verifying boost pressure sensor readings - engine stopped should read the same as ambient air pressure.
Then verify that the turbo actuator runs freely from end to end.

These threads might be useful

For the boost pressure sensor​

P

Thread 'Fault code help please'

Hi guys I have the fault code as listed below and have changed the sensor but still have the fault code showing after reset. I have no loss of power or any other problems apart from the waring lights. would anybody have an idea of what to try next, Thanks.Screenshot 2021-09-16 at 16.19.24.webp

Turbo actuator testing​

mmi

Thread '[T6_measured] 01-Engine - Built-in tests for turbocharger'

01-Engine - Basic Settings​

IDE00457-Test of turbocharger​


HOW-TO​

Engine running​

VCDS > Select > Engine > Basic Settings > IDE00457-Test of turbocharger​

Select "Show Measuring Data" ​

Pick up e.g. the following data items for monitoring:

IDE00021 Engine RPM​
IDE00347 Air mass: actual value​
IDE07736 Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value (bi-turbo only)​
IDE07738 Charge air cooler inlet: pressure sensor 1 bank 1: raw value​
IDE07744 Particle filter: air pressure...​
  • Like
  • Love

Fault diagnosis​

M

Thread 'Fault code P0299 Boost - 2019 Crafter'

Hi , i have a PO299 underboost issue i cant get to the bottom of.
i have borrowed a copy of VCDS and ran the codes, its has stated as follows :

vw crafter 2.0 - daua 2019 fwd
drives fine98% of the time, but suffers a po299 underboost when crusing at about 65mph.
drive fine under soft driving, drives fine under heavey footed driving, just doesnt like cruising or easing off ?

i have so far,
tested the vacum to n75 - 25mmhg
tested the vaccum line to turbo - it holds at 20mmhg
replaced the N75 valve
inspected all vac hoses, which seem fine.
looked that the waste gate actuator, it seems to...
 
Finally got to the end of these problems
First off I decided to replace the egr cooler, this helped about 80% better. Rubbish job to do. Especially on a dsg. However job done. Run nearly perfect but still a bit laggy sometimes and turbo boost fault code came on but more when cruising.
So removed boost sensor, it was choked with oily carbon , had a poke in the hole and noticed even more gunky carbon.
Decided to remove the throttle body. At the inlet manifold.
The manifold was full of this stuff.
So spent about 3 hours pulling chunks of carbon out manifold, scrapping what I could and cleaned the inlet manifold the best I could. Cleaned the sensor refitted and road tested, power resumed and running great again.
The caravelle if full dealer service history.
Gets driven well and gets used on driving holidays to Germany from Scotland
This seem an unstoppable problem a design flaw, and some thing that can not be prevented. So glad the power is back.😃
mmi said:
I would start by verifying boost pressure sensor readings - engine stopped should read the same as ambient air pressure.
Then verify that the turbo actuator runs freely from end to end.

These threads might be useful

For the boost pressure sensor​

P

Thread 'Fault code help please'

Hi guys I have the fault code as listed below and have changed the sensor but still have the fault code showing after reset. I have no loss of power or any other problems apart from the waring lights. would anybody have an idea of what to try next, Thanks.Screenshot 2021-09-16 at 16.19.24.webp

Turbo actuator testing​

mmi

Thread '[T6_measured] 01-Engine - Built-in tests for turbocharger'

01-Engine - Basic Settings​

IDE00457-Test of turbocharger​


HOW-TO​

Engine running​

VCDS > Select > Engine > Basic Settings > IDE00457-Test of turbocharger​

Select "Show Measuring Data" ​

Pick up e.g. the following data items for monitoring:

IDE00021 Engine RPM​
IDE00347 Air mass: actual value​
IDE07736 Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value (bi-turbo only)​
IDE07738 Charge air cooler inlet: pressure sensor 1 bank 1: raw value​
IDE07744 Particle filter: air pressure...​
  • Like
  • Love

Fault diagnosis​

M

Thread 'Fault code P0299 Boost - 2019 Crafter'

Hi , i have a PO299 underboost issue i cant get to the bottom of.
i have borrowed a copy of VCDS and ran the codes, its has stated as follows :

vw crafter 2.0 - daua 2019 fwd
drives fine98% of the time, but suffers a po299 underboost when crusing at about 65mph.
drive fine under soft driving, drives fine under heavey footed driving, just doesnt like cruising or easing off ?

i have so far,
tested the vacum to n75 - 25mmhg
tested the vaccum line to turbo - it holds at 20mmhg
replaced the N75 valve
inspected all vac hoses, which seem fine.
looked that the waste gate actuator, it seems to...
Click to expand...
 
Chubby said:
Finally got to the end of these problems
First off I decided to replace the egr cooler, this helped about 80% better. Rubbish job to do. Especially on a dsg. However job done. Run nearly perfect but still a bit laggy sometimes and turbo boost fault code came on but more when cruising.
So removed boost sensor, it was choked with oily carbon , had a poke in the hole and noticed even more gunky carbon.
Decided to remove the throttle body. At the inlet manifold.
The manifold was full of this stuff.
So spent about 3 hours pulling chunks of carbon out manifold, scrapping what I could and cleaned the inlet manifold the best I could. Cleaned the sensor refitted and road tested, power resumed and running great again.
The caravelle if full dealer service history.
Gets driven well and gets used on driving holidays to Germany from Scotland
This seem an unstoppable problem a design flaw, and some thing that can not be prevented. So glad the power is back.😃
Click to expand...
Where do you think the deposits are coming from?

Got any pics?
 
Jimmy-s3 said:
Can you tell me where the boost pressure sensor is on the CFCA please? I’ve looked online and can’t find it
Click to expand...
Mines is a cxfa engine
If you remove the corrugated pipe that normally breaks at the front
You will see the sensor I think it has 2 torx bolts.
If you remove the throttle flap housing with mine it was chocked up with oily sludge.
When I took out the sensor it was chocked up.
But so was behind it. It took along time to clean out.
 
I’ve just realised, I searched in this forum for boost pressure sensor on a CFCA and this came up but didn’t see that yours is a CXFA…😕
 
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