Hi,

 

So i have recently bought a Skoda Octavia 61 plate 1.4 tsi. I have had the low oil pressure warning message come up. I have changed the oil and oil filter as this really needed doing. I have driven the car for a round a week and this warning hasn't come back. This is good.

 

However... i have now had the EML come on and the code P0299 appears. Turbocharger/Supercharger underboost. The car is not performing as i think it should. Turbo boost pressure wasn't getting past 0.1. 

 

I have checked the actuator, the arm moves, not freely, but it does move with some effort by hand. Where the arm of the actuator attaches using the clip, was very difficult to move by hand, i had to use a metal rod to get it to move. Is this normal?

 

After checking the maf sensor, the n75 valve, it all looked ok. Ive checked the turbo itself, the fan is moving around freely, and the nut is still in place. Following all of the above i managed to get a turbo pressure of 1.5 psi, but thats it.

 

I then used a can of turbo cleaner spraying into the turbo while the car was at 2000 rpm, this has had no effect on performance, and the code P0299 remains pending after clearing.

 

Any advice or tips, i've read various things to check for including PCV valve, or maybe the N249?

 

Any advice appreciated.

 

TIA

 

Matt

Low oil pressure a little worry. Hope pickup or pump not clogged. But hasn't come back.

 

Turbo. Is there a diverter valve. If so it may have failed.

 

Does the wastgate move or reach the two extremities?  Vcds may allow an ouput test to simulate  

 

Underboost issue - you'd be looking for the wastegate to be stuck open or at least not fully closed  

On 10/02/2023 at 13:21, TheClient said:

Low oil pressure a little worry. Hope pickup or pump not clogged. But hasn't come back.

 

Turbo. Is there a diverter valve. If so it may have failed.

 

Does the wastgate move or reach the two extremities?  Vcds may allow an ouput test to simulate  

 

Underboost issue - you'd be looking for the wastegate to be stuck open or at least not fully closed  

 

Since i changed the oil and filter, oil pressure warning hasn't come back. So good news there!

 

I have ordered a boost control valve and diverter valve, i will fit them and see if there is a change.

 

I took off, the wastegate and was able to move it by hand. I was able to pull this out and then it returned in.