warning lights stuck on

[Jondotnet]

Hi Folks,

I have been struggling for a while with an older disco 2 I have parked up. It fires up instantly but the oil light wont go out.

I tried replacing the sender to see if that would help, but it hasn't

Is there a way of checking the wiring to the sender? as its a single wire, does it ground it if the pressure is above the correct level?

Also, what else could it be?

Oil pump problem?

Thanks

J

Edited to add:

This has now become a bit of a wider issue. Whilst testing the wiring (grounding the end of the wire near the sensor) I spotted that the temperature warning light was stuck on too.

So I have an oil pressure warning light and a coolant temperature warning light both that wont go out. From experience, electrical gremlins like this are sometimes caused by earth faults so is there an earth for the dash somewhere that could have got corroded?

Or any other suggestions?

Thanks

 

[German Gruner]

There is no posibility of low pressure warning&" light with corroded ground lines. You must check oil pressure or mount a new oil pressure to see if present sensor is giving wrong alert at pressure higher to 5 PSI levels.
And check temp too, prior to believe sender is not working ok.

Regards

 

[rovercanus]

Check the wiring going to the sensor. It can rub and have a bare spot . If it grounds out it can send you a false signal.
But as Gruner suggested, better check your oil pressure.

 

[Jondotnet]

I have checked the oil pressure and its OK. The temperature warning light is on as well but the engine is cold

Engine is fine, just need to figure out why both warning lights are stuck on. Had a quick look at the wiring and cant see anything obvious

 

[German Gruner]

If pressure is good, you can follow diagnostic in this way: You may try pulling oil pressure sensor cable to disconnect it. If light goes off after disconnect, then your sensor is kaputt. If light still remains on, then your cables are touching ground thru an insulation damage.

Regards