B6 A4 3.0 Quattro CEL and oil pressure low

[neversc0t]

Hi everyone!
I'am new to this fourm also to AUDI
In fact also to a car......
My English is not well

I just got a used A4 3.0 2004 Quattro 150000KM

Now I have 4 problems:
1 There is no warnning sound when I didn't fasten safe belt
How can I switch it on

2 These days the CEL is on
The code is P0021 and P0340
What is this problem?
Change the cam shaft position sensor?
[FIXED]replaced CAMSHAFT and CRANKSHAFT sensor, there is no CEL now

3 when I drive about 20 minutes the red oil pressure low light will on
I checked the oil level.It's OK
Is that because the screen of oil pan is dirty? Should I clean the screen of oil pick-up?
I found a thread is talked about how to clean that,but all the pictures is gone......
Who have those pictures,please post again.
[FIXED]After changed engine oil(EDGE 5w40),oil pressure low warning disapear

4 The lock,unlock,mirror flod botton on drive's door is unable now.also the remote lock botton on my key.
Is this because the wire J386?
[FIXED]By changing a new 15A fuse on NO.22


Thank you!

[2004a4b630QT]

I believe VCDS will let you change the language and it's also the best for reading codes. I wouldn't drive it at all until you read the codes because of the low oil pressure warning.

[pablolizarraga]

Dont drive car w/ low oil pressure light on. I was lucky that the result of low oil pressure light was my oil filter. It was making a strange noise while idling. When i checked dipstick, the plastic coating was chipping off and I suspect that it was clogging filter. Replaced filter and dipstick, no more warning light.

If pictures from thread were hosted through photobucket, try this...

Photobucket Chrome pic fix
https://chrome.google.com/webstore/d...alioapbifiaedg




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[neversc0t]

I installed the pic fix but still can't see the picture
this thread
https://www.audizine.com/forum/showt...pressure-light

[neversc0t]

The oil pressure light is always on in you car?Or just after driving some time?
Thank you!

[pablolizarraga]

The oil pressure light is always on in you car?Or just after driving some time?
Thank you!

I pulled over as soon as oil pressure light went on. Checked oil, waited a few minutes, and turned on engine. Since the light didnt come on again, drove it home and promptly replaced oil filter and ordered dipstick. Light hasn’t come on since.
Dont drive car w/ low oil pressure light.


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[deyrag]

Before you do anything else buy or borrow a mechanical test gauge. Remove the oil pressure sensor located behind the oil filter, screw in the gauge (10x1.0 mm thread) and see what the pressure really is.

Start engine and allow engine oil to reach a temperature of approx. 80°C
Engine Oil Pressure Specifications:
Relative oil pressure at idle speed: 1.5 bar
Relative oil pressure at 2,000 RPM: 3.0 bar

[Turbo510]

Before you do anything else buy or borrow a mechanical test gauge. Remove the oil pressure sensor located behind the oil filter

Unfortunately, it's a 3.0 and not so easy. But 150K km is only 93K miles, just break-in for the V6. Unless really abused, more likely a faulty pressure switch. I had a B5 2.8 and it had the oil light come on (and drip oil) due to a bad switch. The OP should listen for common sign of low oil pressure; lifter click.

[neversc0t]

little update
checked the code P0021 P0340

and new problem

[2004a4b630QT]

Has your timing belt been changed? My belt was full of cracks by 97,000 miles. The belt doesn't age well even if your mileage is low. 7 years or 75,000 miles is the current specification for replacing it. Otherwise, it's probably the cam position sensor based on the codes.

What's the new problem?

[neversc0t]

Has your timing belt been changed? My belt was full of cracks by 97,000 miles. The belt doesn't age well even if your mileage is low. 7 years or 75,000 miles is the current specification for replacing it. Otherwise, it's probably the cam position sensor based on the codes.

What's the new problem?

My car is second hand.So I don't know it has been belt changed or NO.

I have already replaced the CRANKSHAFT SENSOR

After I changed oil, the oil low pressure warning disappeared.

But now I get CODE P0021, and tough idle.

I have already bought a new CAM POSITION SENSOR.I will replace it.

[neversc0t]

update

Now there is only one problem

[shurur9]

It is still hard for me to believe that changing the oil was enough to make the oil pressure code go away.

I would check the oil pressure sensor the next time you do an OC.
Despite the doom and gloom others associate with the failure code, I suspect it is often simply a failing oil pressure sensor.