2012 Audi A4 TDI Oil pressue light **Please help**

[chief_67]

Hi,

I need some advice please. I've had my A4 black edition 2.0 TDI for a few months now and I was getting the oil pressure light on the dashboard. Took it to garage, they did a service and and confirmed with me the oil was dirty as well as the oil filter, so they did the full service.

They also checked the oil pressure after the service by using the tool they had and confirmed the oil pressure was fine.

Now just over a month later the oil pressure light had come back on this morning.

Since the service everything has been fine, no knocking noises, oil level has been fine.

Does anyone have any idea what it could be, maybe change the oil pressure sensor as it could be faulty, as that was not changed at the time of service.

I've read about the HEX key in the oil pump to be changed, but when the garage check the oil pressure after the service they said it was fine.

Off the top of my head I think they said they unplugged the sensor, then plugged their device into the plug and read the oil pressure that way. It must have been a big job as they had to charge me to check the oil pressure because they had to strip it down, whatever that means.

TIA

[Crasher]

It could be the new oil has released sludge in the engine which is now blocking the pickup gauze. That is sump off which is a pain on an A4.

[chief_67]

It could be the new oil has released sludge in the engine which is now blocking the pickup gauze. That is sump off which is a pain on an A4.

When I got it serviced in first week of January the garage did an oil pressure check after the service using their equipment and the pressure was fine. If it was released sludge I presume the oil pressure will give a low reading. Do you think it still could be released sludge.

I was leaning towards changing the oil pressure sensor. I've read that the Audi petrol are known for the pickup pipe blocking but not the diesal's.

[Crasher]

I have seen bad Diesel sludge, it is how we acquired or loan car Passat.

[chief_67]

An update on this, spoke to my mechanic who is a VAG specialist who told me could be oil pressure sensor faulty, so bought a new one from Audi and will get that changed next week.

I did ask him about the pickup gauze could be blocked, he said doubt it will be that because when we did a oil pressure test the readings were fine.

Since it came on first on the 26th feb up until now it's only been on twice, and no issues with engine.

[chief_67]

Need some advice please. So got the oil pressure switch changed and still bringing the light up. The VAG tech told me to check the wiring next so need to go to an electrician.

I did say do you think it worth checking the pick up gauze is not blocked, he saying it can't be that as when did the oil change 500 miles ago we did a oil pressure check and the readings were fine.

Need some advice of what next step to take. The car drives fine no issues even when the light comes on.

[Crasher]

You need to get the pressure checked again to be 100% sure it is a false alarm. What is the VIN and mileage?

[chief_67]

Update is that I've ordered a pick up pipe from Audi and will fit a new HEX key at the same time.

Spoke to KMB parts direct about wanting to buy the hex key and he is advising me to change the oil pump and balance shafter as just changing the Hex key will end up bringing the oil pressure light back. He saying if the Hex is worn so will the inside of the oil pump.

I don't know if he giving me good advice or trying to sell me the oil pump and balance shafter.

Their website: Oil Pumps from KMB Parts Direct specialist Oil pump replacement parts, Audi 2.0tdi, VW 2.0tdi, engines, support, help, advice, Sheffield, UK, England.

What you guys think.

[chief_67]

You need to get the pressure checked again to be 100% sure it is a false alarm. What is the VIN and mileage?

Mileage is about 105,000. It's a 2012 A4 2.0 TDI 143bhp CJCA engine code.

[Crasher]

CJCA started for 2013 model year. You need to strip it down to check the hex key wear but at that mileage it isn’t common for the 100mm key to be a problem