A4 3 Beeps of death

Ok so this is a well-documented issue with the 1.8T engine and sludge.

but . . . like many who have had the dreaded 3 beeps of death and the big red oil can on the dash I took the sump and pick up off to give them a little clean. Both were heavily sotted and clogged up but with the aid of a dishwasher for the sump and pressure washer for the strainer I got them all sparkly clean.

Now before I embarked on this wonderful adventure I had a local garage checkthe oil pressure which oddly was 65psi at idle and 95psi at 4k rpm and even more strange the oil can vanished from the dash and did not come back on for another 300 miles ? However, this time it came on every time I slowed down for a roundabout and then went out a short while after and sometimes just for fun(not sure that's true but it did seem that way).

So here is the problem, within a mile of driving with the new clean sump and pick up beep beep beep !! Checked the level and it was bang on. Drove a bit more and beep beep beep again. It seems to be back to where it was before I cleaned the sump. Oh and it all sounds lovely with no tappet rattles and infact it drives just as you would expect.

Any help would be greatly appreciated.

Thanks

Car is a B6 1.8T Quattro with the AVJ engine.

the oil pressure switch could be ******

The garage changed it when they did the oil pressure test but there is no reason to suspect it has not happened again. I will order a new one.

Ok so another oil pressure switch fitted and the problem still exists. I have tried with both the sump sensor disconnected and the oil pressure switch disconnected and whilst it knows they are not connected, the 3 beeps sound as soon as I rev the engine or drive. Hmmm help would be most appreciated. Thanks

Hmmm well this is perhaps a bit stupid, but the problem has been resolved by firm pressure on the sensor plug and waiting for the all important "click". Its a long plug so I understand now why both the garage and I failed to seat it correctly.