200tdi oil pressure light stays on a bit after starting.

[Tommo]

when i fire it up the oil pressure light stays on for a second or two which i never remember it doing when i bought it.

worrying.

never comes on whilst running once its gone off.

Figured it could be a sticky sensor but i fear its the oil pump or even worse the crank!

not stopping me driving it but i dont like it.

[land-def-90]

had a similer prob with a series 3 a few years ago, a new sensor fixed it,

[Bob696]

mine does that ... always has ... owned her for over 4 years and no engine problems

[Range Rover Blues]

Sensor faulty

oil by-pass valve sticky or bust

oil needs changing

wrong oil filter (some have anti-backflow valves in them)
crank bearing wear

hole in head gasket too big

[Tommo]

Sensor faulty

oil by-pass valve sticky or bust

oil needs changing

wrong oil filter (some have anti-backflow valves in them)
crank bearing wear

hole in head gasket too big

whoah there!

right, sensor could be faulty.

not sure what an oil bypass valve is.

oils about 2000 miles old.

oil filter was a britpart one

and for gods sake i hope its not the bearings. runs smooth though.

[Range Rover Blues]

Then swap the sensor, that's an easy job.

I don't know of an easy way to measure oil viscosity, but I found that Blue was using more once the oil went a brown colour.

Near or inside the pump is a pressure release vaove that limits the max pressure the oil pump delivers, too high and the oil can damage bearings as it flows though too fast.  This valve has a seat, dsometimes it's rubber, and can lead to probelms with oil pressure untill the pump is flowing fast enough to overcome what is effectively a leak.

You could put a pressur egauge on, even as a temp thing, to check what's going on.

Alternatively use an oil with a cold-start additive for peace of mind.

[Rich_P]

You'd be terrified if you owned a leafer.   :lol:  Oil pressure light comes on under very heavy braking as the oil sloshes about and the pressure sensor is starved of oil.  ;)