Hello all,
On the way to work the CEL came on.

The scan tool reads P0116, P0128, and P0506

The P0116 and P0128 indicate the thermostat is stuck open and the car is not reaching operating temp.

P0506 is low idle speed.

I'm going to have the thermostat replaced and see if that cures it.

Has anyone else been down this road?

 

Just a follow up. All is good now after replacing the theromstat. I had the EXACT same sitaution as this post.
https://www.jaguarforums.com/forum/x...verted-111940/

It would seem that replacing the thermostat should be a "must do" on our cars.