- So i thought this was related to my MAP sensor... however car is running great now new MAP is fitted. However after driving the car for a while, and usually when on boost the oil pressure warning light comes on with 3 bleeps, its not a maintenance light.

Reckon replace the oil pressure switch on the oil cooler? 

Is this the part?  http://www.eurocarparts.com/ecp/c/Skoda_Fabia_1.9_2004/p/car-parts/fuel-and-engine-management/engine-parts/engine-management-switches/?466440160&1&53c5c668c4b9f3405148f55d6b1675b24ff041e7&000519

Should be (or be equivalent to) VAG part number  038919081K according to here. 

If it looks like it is leaking oil, definitely replace it, even if it doesn't seem to be, it's probably worth the gamble for £12.

When was the oil last changed? Is there any whiff of diesel on the dipstick?

Check the wiring first I would,could be tight somewhere and when the engine moves it's most it's stretching it

Should be (or be equivalent to) VAG part number  038919081K according to here. 

If it looks like it is leaking oil, definitely replace it, even if it doesn't seem to be, it's probably worth the gamble for £12.

When was the oil last changed? Is there any whiff of diesel on the dipstick?

 

Oil changed last month.

Check the wiring first I would,could be tight somewhere and when the engine moves it's most it's stretching it

 It always seems to come on just as the engine gets warm, so i guess as the oil becomes thinner... i hope its not the oil pickup.