Hi. Now im driving in the dark here in the uk i have noticed my oil pressure light is always on.

It never goes out when the ignition is off it still stays a light. Here is 2 photos of the light



The light never goes out when you start the car it goes bright then after a second when the pressure goes to half way on the dial it dims to the other picture i took.

Any help

 

In both pictures the gauge needle is setting on 0 indicating that you have no oil pressure or a failed sensor. The sensor is only a contact closure at about 7 psi. With the contact closure required to extinguish the red light I would suggest that you resolve that before tearing the instrument panel apart.

The second picture might indicate that the light stays on with the engine off as the VM is at O. Is that the issue?

Some oil filters that are sold for the XK8/R do not have a back flow valve allowing the oil to drain back into the engine when off. That causes the oil pressure to stay at 0 psi for several seconds before the filter fills back up. Does that relate to what you are seeing?

 

should my 08 XK8 have this " XK8/R do not have a back flow valve" valve? If so which kind of filters have these in them?

 

Any car that has the filter mounted in other than the open end up position should have a back flow valve. The issue is not Jaguar specific. If you had your oil changed and it takes 5-15 seconds for the oil gauge to come up then an incorrect filter was installed.

No list of filters with/without the valve exists that I am aware of but the box should say it does have one. If there is no mention then I would assume that it doesn't.

 

Mann filters do not mention having a check valve on the box or filter. However, their web site does specify that they have a check valve.

 

Hi, the pressure is fine and goes half way about 1 second after i start the engine and the light then goes to the dim light. In both those pictures the engine isnt running.

basically what im trying to say is the light is always dim without the keys in or without the engine running then when i turn the ignition on it turns bright red then when i start the engine it goes back dim about 1 second after when the oil pressure is at halfway.

is there a ground wire somewhere that is making the light stay on, thats what im thinking? its a worrying light to have on

 

Well the oil pressure gauge is nothing but a check light also, it does not read actual oil pressure. The oil pressure gauge is showing what the ECM thinks is the oil pressure. There is no oil pressure sending unit only an on/off switch. The fact that the needle moves at all proves that you have oil pressure and the change in light brightness seems to verify this.

My guess is you have a short somewhere I the oil light circuit, have not looked at the electrician diagram but most of the indicator lights short to ground to come on.

 

Check the red/white wire that runs from the yellow connector on the speedometer cluster to the connector on the 3-gauge cluster for damage.

If you decide to unplug any connector, be sure to disconnect the battery first.

 

Ok thanks ill check the wires when i get round to it, i have been looking at it more and more while driving and it occasionally flickers randomly so I'm sure thats pointing more towards a loose wire somewhere.

not looking forward to pulling the dash apart

 

The Center veneer pops off fairly easily, you will then have access to the 3 gauge cluster after removing a few screws.. start there and check the wires, it'll take you 15 mins. The drivers dash takes a bit longer but not much.. RevSam has videos on both. IT's really easy (compared to most jag work)

Edited to add link for center dash:

Here's a link to Sams Youtube channel with many maint videos
https://www.youtube.com/user/sam1174

 

<embed width="600" height="361" type="application/x-shockwave-flash" allowFullscreen="true" allowNetworking="all" wmode="transparent" src="Www.static.photobucket.com/player.swf" flashvars="file=http%3A%2F%2Fvid1015.photobucket.c om%2Falbums%2Faf279%2Fsteeevo%2FMobile%2520Uploads %2F973322B3-41E7-4839-B764-ED12E9A1A6E1_zps0pxiukeu.mp4">

 

Here is a video of what is happening

http://www.s1015.photobucket.com/use...iukeu.mp4.html

 

steevo,

When you post web links to the forum, leave out the http://

http://www.s1015.photobucket.com/use...iukeu.mp4.html

With the link you posted above, replace the http:// with www. to make the link work.

Graham

 

Hi Guys,
did you find out what caused the light to stay on when everything switched off, mine just started doing it, had same problem with Fiat Coupe turned out it was the alternator rectifier pack faulty.
Regards
rrosscoe

 

Hi there

Old thread I know but my 2005 xkr has exactly the same issue... and I can't find any recent topic about this particular problem.

Steevo, if you are still around, did you manage to fix this on your car and how please?

On my car, it does exactly the same : the oil light stays on , even if the car is shutdown, door locked etc.

I left the car at a jaguar dealer shop, they tested the wiring from the sensor and said it is ok. They think the problem might be from the gauge itself or the gauge wiring behind the dashboard. They do not really know.

Did anyone else experimented this kind of problem ? Any ideas ?

Thanks,
Antonin

 

Hi. I never fixed it. I new it wasnt a major problem so ignored it. Im sure it was some kind of fault on the ground wire. Then I sold the car a bought a mercedes

 

I recently bought a minor instrument pack (the three gauges) quite cheaply on ebay. If you can find one cheaply enough it's easy enough to swap them over - at least then you will know if the fault is in the minor instrument pack or the main gauges. It can only be one or the other and if you are lucky its the smaller gauges. The fault is likely a failed transistor or mosfet that drives the light.

 

Hello, Thanks for your reply.

The minor instrument pack is the cluster with the 3 jauges ?

 

That's right. The major instrument pack is the speedo/rev counter etc.