The low oil pressure warning comes on in my 2010 Superb 1.8 TSi. when I exceed 3,500 r.p.m.

The garage has fitted new pressure sensors, but the fault remains (light comes on at over 3,500 r.p.m.)

They now say it could be the oil pump. Could it be that? And if so, why is OK below 3,500 r.p.m.?

On nearly all vehicles the speed of the oil pump is dependent on engine speed because it runs off the engine. The faster the engine spins, the faster the oil pump spins. The engine expects to see the oil pressure steadily climb with increasing rpm. Most likely the oil pressure is lower than expected at those revs, thus triggering a fault.

I'd ask them to check the condition of the oil pickup in the sump before they throw a new oil pump at it. It has a screen on it to catch larger particles before they reach the pump and filter. If it's blocked you'd see low oil pressure.

Which engine do you have? The older 1.8 seems to only have a fixed pressure switch that actuates at a set pressure. The newer engine has that same switch, plus another and an oil pressure regulating valve. Barring oil pump problems and clogged pickups there could be an electrical fault in those areas.

 

I'd find another garage. While it is possible that the oil sensor was also faulty, I'd wager they didn't check it out for functionality, nor checked the wiring out. I'd also wager they're a bit trigger happy with the old parts cannon.

The engine is the later one with the 2 pressure switches. They changed both of them, but no luck.

Where is the regulating valve located?

Guess those three SSP linked below could clarify to you the oil system on your Gen2/Stage two engine EA888. Either N428 valve or its connection to ECU, connections to both oil pressure sensors or oil pump itself. Hope for no major damage inside engine happend, camshaft bearings and bracket, balancing shafts ...

 

https://www.briskoda.net/forums/applications/core/interface/file/attachment.php?id=99095

https://www.briskoda.net/forums/applications/core/interface/file/attachment.php?id=99097

https://www.briskoda.net/forums/topic/435324-2012-octavia-vrs-20tsi-fl-water-pump-on-the-way-out/?do=findComment&comment=4899933

 

https://www.briskoda.net/forums/applications/core/interface/file/attachment.php?id=94076

https://www.briskoda.net/forums/topic/419089-yeti-burning-oil-should-pistons-and-rods-be-replaced-as-well-as-piston-rings/?do=findComment&comment=4859761

 

https://www.briskoda.net/forums/topic/266114-18tsi-and-20tsi-engine-failures/?do=findComment&comment=4857230

 

Edited 19 September, 20178 yr by rayx

"hurriedly puts  car in auction" ;-)