Oil Pressure Light

[Mark Adams]

Driving home in the Disco I noticed that when I stopped at a roundabout, I saw the oil pressure light came on, flickered at first, I quickly turned off the engine and then started it. The light went off and did not came back on until I parked up at home, when it started flickering again.

Do you think this is just faulty wiring/sensor or a genuine oil pressure problem? Seems strange that it goes off when the engine is turned off and on again.

[Team Idris]

For me it normally means wallet time, but you may have better luck

Best thing is a proper gauge so you can tell what is going on.

[Boydie]

low oil level can be the cause --- a good indicator of this is did the flicker occur during a sharpish turn? Even so I agree with Idris, fit a guage, mine runs on 7psi at hot idle and 27psi with 10 psi boost at 2000 rpm = 100kph cruising speed.

[Mark Adams]

If it is a mechanical problem then I guess the big end bearing shells are the most likely cause, does anyone know what these are like to change? I have a fully kitted workshop and pit and would regard myself as above average DIY mechanics but never changed these before.

[Mark Adams]

the oil level is on the max mark, it happened when stopping at a junction, it was fine until then.

[disco_al]

change the sensor first - could just be a faulty/blocked one causing a dodgy signal to the light. ultimately get a decent gauge to keep an eye on what's going on. when was the oil last changed?

[fatbloke]

Is it a 200tdi ?

[Mark Adams]

It is a 300tdi.

[Mark Adams]

I have just got it mot'd after sitting for a long time so the oil has been in the car for about a year but only done about 1000 miles in that time. I am going to change it with 15/40 mineral oil as it will need a change, I will change the oil pressure switch at the same time.

Do you recommend a particular brand of Oil pressure tester? I do not want to buy one that does not have the correct adaptor.

Mark.

[defv890]

Hi see this many times before

I think it's the oil pump gear bolt working loose

U should check this

[Mark Adams]

Just to update the topic.

I changed the oil and filter with 15/40 mineral oil and changed the oil pressure sensor at the same time. I have now driven it a little and can say that I have not seen the light come on since the sensor/oil change.

Thank you

[BogMonster]

Sensor then, 99%, I replaced it I think 9 times in the time I had my old 300Tdi 90...