Hi, I'm after some advice:

My normally reliable 02 plate Fabia 1.4 classic has recently been plagued by a so far unsolvable problem. The oil pressure light comes on intermittently. The oil pressure has been checked by my independent garage and an RAC patrolman. Oil pressure is fine. A new sensor has been fitted (genuine Skoda part) and it has had an oil and filter change, Wiring has been checked and oil pressure checked again (still fine), but light still coming on (though not staying on). My next step is to take it to local main dealer.

Has anyone any ideas as to what may be behind this, in view of all the obvious things having been checked out?

Thanks.

The switch is a normally open type, which shorts the wire to ground when oil pressure is sufficient. This means that an intermittent wiring break or bad connection will look the same to the cluster electronics as genuine low pressure.

The wire seems to go direct to the instrument cluster, starting out as a black wire at the pressure switch, but turning into a green/white wire somewhere on its way to cluster connection 32a/23 (ref Haynes).

With ignition switched on, check for voltage (probably 12V or 5V) at the connector which plugs onto the pressure switch, and see if that voltage can be made to disappear by waggling the wire.

Try to find the junction where the wire changes colour and check that.

Thanks for the advice, will get it checked out.

Under what circumstances does the light come on? Is it after a run, and goes out when it cools down a bit? I had a Golf Mk2 GTI which did this. Oil pressure checked out fine. Put a hole in the side of the block after carrying on with the light on.

The crap in the bottom of the sump blocked the oil strainer when very hot then dropped away when it cooled, so, when tested, the oil pressure was good. Bye, bye engine.

If the car has been used in town constantly and all changes done when the oil was cool it is possible for a lot of rubbish to be left in the sump.

Or some lazy so and so had sucked the oil out as some seem to think is a good idea. Take note Pela pump owners, this is BAD.

Hi same problem on a 52 reg, have same problem with coolant too. Just serviced 2 weeks ago on day of purchase