Garyha4b8

Hi i have a 2013 audi a4 b8.5 2.0tdi CjCA engine code. I have a low oil pressure issue. I have just replaced hex key and balance shaft this week and new oil pressure sensor but i still have the problem. The problem only seems to happen when engine gets hot and im either slowin down or at lights. I get a low oil pressure message on display. I should of replaced oil pump when i had everythink off. Done a bit off research and a few people have said they have had problems with the pressure release valve in oil pump. The engine sounds normal no rattles or knocks coming from it. Any help or advice would be much appreciated. Thank you

biju2000

I have the same engine and I also did change the pressure sensor and the oil pump, the hex was modified to 8mm but the problem persist.
I've made a second intervention and change all the main and rod bearing. Nothing changed in oil pressure. Still "low pressure" alarm and 0.5 bar on hot idle measured with V.A.G 1342 oil pressure tester.
Did you solve your problem? Thanks.
PS. our pumps have 2 valves, one is pressure release valve and another one I think is volume control valve.

andliu

Hey i had the same issues and fixed it.. its the PCV valve diagphram.. you get a misfire and low oil pressure fault, i also replaced both oil pressure switch sensors. brown and blue... theres two.

biju2000

Hi, we don't have PCV on our TDI CR engine, it's a CCV but is closed so no pressure escape there. Also we have only one sensor on CJCA, green one, rated at 0,3 to 0,6 bar and I already change it.

andliu

my mechanic friend said check

and your EGR valve

2010A4

Hey there. I was hoping if you can explain how you replaced the blue sensor. looks like a hassle to get to. would really appreciate any help.

andliu

audiosMF

I know this may sound dumb, and maybe I'm just not looking in the correct spot, but where is the blue sensor located at? I've already replaced the brown sensor but I cannot find the blue sensor on the car.

Jud Tofflemire

It's very difficult to get to, I just did mine. It is beside the tensioner for the serpentine belt.

To change mine I put my car nearly into the service position. I loosened the bolts for the aluminum crash bar, but did not fully remove the bottom ones. I had to disconnect the small coolant line, but I didn't need to drain the coolant.
I then was able to pull the lock carrier back to gain access to the switch. I used a 24mm deep socket to remove it.

Anyways I then put an M10x1 pipe fitting in and connected a pressure gauge (with about 10ft of tubing) and measured the pressure vs RPM.

In my case it was not good.


There appeared to be a lag before the regulator would increase the output pressure. I would have to exceed 3650 RPM before it would achieve 3.5 bar.

I took about 3 sets of readings to prepare the below:RPMPressureSpec LowBarPass / Fail6502011.378951OK14002211.516847OK14052511.7236 89OK20002611.792637OK220026.511.827111OK22002711.8 61584OK23002811.930532OK295027.511.896058OK300027. 53.51.896058FAIL310027.53.51.896058FAIL3100273.51. 861584FAIL3200283.51.930532FAIL3400283.51.930532FA IL360030.53.52.102901FAIL3600313.52.137375FAIL3600 483.53.309483FAIL3650523.53.585274OK3700443.53.033 693FAIL3700523.53.585274OK3800373.52.55106FAIL3800 363.52.482113FAIL3800403.52.757903FAIL390042.53.52 .930272FAIL3900533.53.654221OK3950453.53.102641FAI L395046.53.53.206062FAIL3950483.53.309483FAIL39504 93.53.378431FAIL3950503.53.447379FAIL4000513.53.51 6326OK4000523.53.585274OK4000523.53.585274OK
Anyways good luck replacing the switch. I'm having this issue after a timing chain tensioner job.

Hopefully this helps...

Jud Tofflemire

Hi Sorry for the double post. The oil pressure is nothing like the old 1.8TFSI Engine. Check out the self study program:

SSP_436

The oil pressure vs RPM can be found on page 29. The behaviour I was seeing was in spec.
I don't want to mislead you with my previous post, but I cannot figure out how to edit it.

We have self regulating oil pumps it looks like. Anyways check out the self study program for more info.