Cause of oil beeper?

[Bibby]

Would crap oil be a cause for the oil pressure warning lamp to keep bloody flashing?

Gauge seems to be reading ok and oil level is fine, but today the warning lamp has started to beep every two minutes once warmed up.

[S2 Ant]

If the level is fine and pressure looks to be ok, then its probably a dodgy connection on the sensor itself, possibly due to all the wet weather of late?

[Bibby]

You couldn't point out to me where it is could you?

[S2central.net]

Below the water rail is a kind of cylindrical shaped sensor that is screwed into the block with two wires attached. Pretty sure one is a blue wire... Sometimes these sensors fail and/or sweat oil giving erroneous readings.

Below that is another single wire oil sensor that is screwed into the block.

When do you get beeps - at idle or cruising? There is supposed to be an alert at 0.3bar below ~2500rpm and another alert at 1.8bar if revs exceed ~2500rpm.

The two wired sensor is the oil pressure sender and 0.3bar alarm switch from memory. The one wired sensor is the 1.8bar alarm. I might have that bass ackwards so no guarantees !


Paul

[martinjs]

This happened to me last year, it was the lower sensor (one wire). Was a bit of a swine to get out, all rusted up. Had to wait till i did a rad swap to get sufficient access to it.

[S2central.net]

Yes they are both a PITA - have had to change a few of these for other folk...

[Bibby]

It hasn't beeped at idle, just when driving about today, and definitely every time WOT.

I'll have a look for it if the rain ever stops...

[porkkis]

The low pressure sensor is used below 3000rpm and the high pressure above.

The single one is the high pressure and the larger one with integrated gauge sender is the low pressure sensor in our cars.

(Btw this is not always the case in audis, they may be other way around!)

[Bibby]

Never got a chance to have a look at it today, but went for a spin this evening.... no beeps.

Don't you just love intermittent problems?

[martinjs]

Check the wire that connects to the sensor, It can work itself loose.

[Bibby]

I've been ignoring it lately but it's doing my head in now. Definitely only kicks in at approx 2200rpm. Cruising in 6th at those revs, oil pressure gauge indicates between 3 and 4 bar.

This definitely a rad out job? I had a peek for the sensors.... maybe if ET gave me a hand?

[Graham]

Is it definitely oil and not power steering fluid, mine does this when i have lost a little fluid moving the pump or disconnecting the pump supply pipe but there is sufficient to not activate the alarm until the revs get over a certain level and the fluid drops.

[Bibby]

I don't think it's the hyds because I checked that the other week.

I had the alarm for that going off after I'd cleaned under the engine bay. The little plunger had stuck down on the filler cap.