Hi I have recently bought a 1999 90bhp octavia Est which was fine until I parked it up for five weeks whilst I sorted out the insurance. Now when the engine goes over 1500rpm the oil pressure light comes on and the audible device comes on. I have now replaced the oil with some semi synthetic 10/40 and now the oil pressure switch and still the problem occurs. Any ideas or is the engine screwed!!

The car has done 214,000 miles mostly on a motorway and has a full main dealer service history.

cheers jcb

The oil pressure light comes on as the engine speed rises!?

I think it's either the oil pump needs replacing, or an electronniccy thing's got confused.

At the moment I think that I will fit a guage and see what the pressure does as the engine speed increases

You tried a new oil filter? Get a genuine dealer one for the car as they are cheap as chips.

These can block up causing oil over pressure rather than under pressure.

Failing that i would be a bit worried about driving the car on under pressure or over pressure.

I thought that changing the oil and not the filter had gone the way of the 3_000 miles or 3 months oil change?

I thought that changing the oil and not the filter had gone the way of the 3_000 miles or 3 months oil change?

I'd hope so, but then I have had a filter go funny on a car, took it off, put a new one on, topped the oil back up all good.

The thing had collapsed internally and the bypass valve was operating meaning oil was getting around but obviously not being filtered. I got a new one FOC for the next change and I guess it was just a one off, slight fault in the thing that made it fail.

Either way with an oil warning light on low pressure oil = not enough lube, so shagged engine and high oil pressure = oil getting where it shouldn't and problem in many parts.

For

Agreed, although I've seen the oil light signalling when there was no obvious problem, and the diagnosis was that some largish particles had got disturbed at the last change, and were now stuck in the sender capillaries. Saying which, the OP does say that he's replaced the sender since the oil change, so that shouldn't be an issue.

Oil pump is certainly a good candidate at that mileage, but then again so are a multitude of seal, but if you are not loosing oil I would certainly give the filter a change and if that doesn't work get it diagnosed and fixed ASAP.

Quite; anything you read on these fora wrt diagnostics should always be read from the the point that we've not seen the car and are reliant on the quality of your description to make a diagnosis,

If the response to your query is another question, it's diagnostic method in action, not idle curiosity.