Turbo under boost code

Ebz13

New member

• May 29, 2018

• #1

My car is a 2012 gti. Check engine light came on a few days ago. Scanned it with a buddy's cheap scanner and came back turbo under boost. Started doing some research most of what I found pointed to bad turbo. The car doesn't seem to be loosing power though. It has a forge diverter valve on it. Wondering how to go about diagnosing the problem and what others have found with this. Don't want to throw a new turbo at it if it could just be the diverter valve or a sensor. There is some oil on the diverter valve as well as the sensor. Any input is Greatly appreciated. Only owned the car 4 months, 81,000 miles .

Sent from my SAMSUNG-SM-G930A using Tapatalk

 

M

MmmmmBoost

Ready to race!

• May 29, 2018

• #2

Is that a forge DV spacer ? Those things are known to be crap.

 

Ebz13

New member

• May 29, 2018

• #3

MmmmmBoost said:

Is that a forge DV spacer ? Those things are known to be crap.

Click to expand...

To be honest not 100% sure bought the car off a used lot and I am finding more and more things done to it/problems

Sent from my SAMSUNG-SM-G930A using Tapatalk

 

Ebz13

New member

• May 29, 2018

• #4

So it does look like a spacer to me (still new to all this kind of learning along the way). Order a upgraded diverter valve kit. Hopefully fixes the issue. ???

Sent from my SAMSUNG-SM-G930A using Tapatalk

 

realcyberbob

Go Kart Champion

• May 29, 2018

• #5

If I were you, I would remove the Forge spacer, check the DV for tears if it has a rubber diaphragm (if it's piston style, you don't have to worry about tears), and install the DV without the spacer to see if that fixes your problem.

 

F

fradooooo

Passed Driver's Ed

• May 30, 2018

• #6

He’s not going to be able to remove spacer if he doesn’t have the original bolts since the spacer bolts are extended. Small amounts of oil on the diverter valve is normal due to the pcv system. Remove and inspect the actual diverter valve like others have said


Sent from my iPhone using Tapatalk

 

Laimface

Ready to race!

• May 30, 2018

• #7

In that case, but a GFB DV+. Then check for other boost leaks.

 

Ebz13

New member

• May 30, 2018

• #8

Gonna check it out after work today either way I wanna remove the spacer. Thanks for the input guys hoping the diverter valve is the cause.

Sent from my SAMSUNG-SM-G930A using Tapatalk

 

M

Messy

New member

• May 30, 2019

• #9

So was it the DV?

 

flight1us

Ready to race!

• Jun 21, 2019

• #10

Bumppp

 

Benxxz8

New member

• Jun 29, 2021

• #11

If any one does want to go back to stock DV and lost the bolts like me, here’s the size.
5mm Allen Bolt
M6x1.0 Thread pitch
16mm Shank length