Hi all, well i had this problem with the jag, about a week ago after about 40 mins of driving i had the engine light come on with 'Restricted Performance' warning and the coolant temp gauge dropping to cold. After restarting it was fine.
Checked fault codes and got PO116- Engine coolant temp circuit problem.

I cleaned codes and the wifes been driving her every day for the last week with no problems.

Today i just done 2hrs driving and as i got near home the same problem happened, so as soon as i got home i left the jag running and pluged in the laptop and looked at live data- coolant temp 76c (which is not right after a 2 hr drive), gauge not working and code PO116 again. Also looked at lpg ecu and that said 76c also. Turned off engine and restarted and all back to normal, gauge working and temp about 92c.

Coolant level is ok etc.

Any ideas??

 

Check wiring / swap sensor.

 

Well i just had a good look, now its cooled down and the last owner has replaced the thermostat and the sensor and i have checked the wiring, but as my lpg ecu is connected to the same sensor and is reading the same c as my laptop plugged into the obd plug it can't be wiring but must be the sensor but its new??

I think this problem is not a new one, as the thermostat/sensor been changed!

Any ideas??

Thanks Simon.

 

What I don't get is then the coolant gauge drops down to its rest with fault code, limp home etc, why the obd saying it 76c and gauge showing engine stone cold.

 

Where are you going with that? Have you checked wiring and/or swapped sensor? If not, I'm mildly curious as to why not.

 

It sounds like the sensor is the common link between the two systems.
If it was mine I'd start there.

 

hey, I am suprised that someone or some people didn't mention the sensor!

 

Which sensor?

LOL

 

Checked wire looks ok and fitted a new Jag coolant sensor today.

So im waiting to see if the fault code comes back!