Oil pressure buzzzzzzz someone help me please

Hi all

this problem has been talked about but having read through the posts I think the exact ins and outs are not covered enough for me to correct my problem.
And I know for certain oil pressure is fine as fitted gauge directly

The Problem
Oil pressure warning light and Buzzer comes on when engine reved above 2500

there is no oil pressure warning lamp flash even when ignition just turned on and engine still off.

What I've done
1stly I have earthed both oil pressure switches with ignition switched on and still no flash of oil pressure lamp in dash so I suspect lamp is not getting 12 to one side atleast.

with engine revved above 2500rpm and left to idle (buzzer and oil light on)
tried removing both oil pressure switch connections and even earthed them

both of these attempts to resolve have failed.

Thoughts to resolve from other posts

some say circuit board at fault but does not say precisly what to do to disconnect it as I don't mind this option as gauge is fitted.

some say provide another earth to dash clocks but not sure which wire so that I could even connect a simple wire to diagnose this is the fault. others say this wire has to go into the Board somewhere?


So what should I do

your advice is greatly appreciated. I feel I have illiminated the pressure switch senders from the problem as I have removed connections and tried earthing direct. via wire from battery to each wire under bonnet.

sincere thanks to all replies

Paul

checked both pressure switch terminals whilst disconnected and there is 0 volts to the oil filter high pressure switch and only 4.9 volts to the low oil pressure switch on the side of the cylinder head with ignition on only.

does this help

cheers
Paul

It soulnds like you've done this but I'd put the oil pressure switch/wires on one side and re-check ALL the earth leads you can find - and there are quite a few.

Including (but not only)

• Earth wire to valve cover bolt

• Earth strap from engine to front bulkhead

• Earth from fusebox to body

• Connections to battery

and I'm sure there are more.

Attack all of these with a wire brush and some sandpaper. Make sure shiny metal is bolted to shiny metal.

Then switch on and see what happens  - checking voltage drops etc.

Also - and you may have done this already - pull out each relay in turn and shine up the terminals with sandpaper.


Do you know that the oil pressure is OK? Just in case you have a genuine oil pressure problem and the buzzer is doing its job properly.


If you're still getting probs, I would extract the clocks and take a look at the oil pressure LED - check that it is working - and of course that it's in the correct way round….being a diode it only works one way, not both like a regular bulb. Then inspect all the tracks in the flexible plastic circuit board - see if there are any breaks. You didn't say if your golf had an MFA - if so, what oil pressure/temp is it showing?

I've not had this prob myself so the following may be a dumb question - are the two oil pressure sensors connected to the right wires?

If NASA can crash a satellite into a planet cos they used inches instead of centimetres…….

finally - what weight oil are you using? If it;s very different (more advanced) than wolfsburg standard then the switches may be fooled into thinking you have low pressure.

Ali