Feel free to Skip to bold if you don't feel like reading all of this.
I am about 8k into a 10k oil change interval. I am driving home from work on Friday, and the red oil can with no other words (sensor/min) shows up and beeps. Freaks me out so I pull over shut it off and dig out manual. I read that it's bad - low oil pressure. I check the oil, it's low but not really low. I start it up and the warning is gone? I drove home slowly, parked it, added about .5 quart of oil to bring it up to full and started it again - no warning light.
I started it up on monday and pulled out about half way down the block (whenever the revs got over 2k) the light comes on. Park it and take the wife's Touareg. I got the vag com on it last night and couldnn't get it to throw the oil pressure warning - it was "OK" and I drove it around the block etc. Great - fixed itself, my kind of car.
Wednesday morning - today - I go out start it up and let it warm up for 5 minutes even though its like 40 today. I get about 7 miles into my trip when it goes off again - it doesn't stay on though, it comes and goes. Basically just enough to really make me nervous but then calm thinking it's a sensor, then nervous waiting for the engine to seize.
Ideas? Is it safe to drive 30 minutes to the dealer? If I get a manual oil pressure tester gauge, where is the test port on the 2.7? Just do an oil change? Just install a new sensor? I've read conflicting reports - is there 1 or 2 sensors on this one?
if you have low oil pressure, its nto safe to drive at all. But have hope, i think your oil pressure is fine. here's why.
1. these cars rarely lose oil pressure
2. the symptems you describe, OP warning off at low RPMs (when pump flow is low) and on at high rpms (when pump flow is high) is both back-assward, and a common sign of the OP sending unit(s) failing. I dont know the specifics on your model, btu there are two senders and if one is out of calibration with the other it alarms. Fail safe. And scary.
To be safe, drive below 2k and get it checked asap. Or better yet, have it faltbeeded. Do you have AAA or similar?
Agree with others that 10k on a turbo car is a long time, but i feel it is a red herring to the pint at hand.
Oil change/sensor change seems to have fixed it. I ran it for 20+ minutes up and down the road watching the vagcom and 99% of the time it was ok - sensor reading ok. No warning light, got oil up to temperature, probably went about 15 miles mixed in town/highway. Everyonce in awhile looking back through the log it was reading low pressure, but it was only at idle and then only when it dropped below 700ish RPM. Any chance this is normal and the car knows not to fault on these errors? It wont' read them in park, but it will in drive idling and its only sometimes when the rpm drops down.
Mostly - I'm glad there's no light and I don't have bad problems.
-easiest to get to it while oil filter is out.
-Sensor on the 2.7 is right above oil filter housing it screws in towards the front of the car (plug faces back of the car when installed).
-24mm deep socket for the sensor
-had to drop sway bar (left ends attached)
-had to pull the rubber intercooler(I think that's what it is) hose and steel one (not fun).
-Steel section screws into sump with 2 #5 allens.