Hi am a  Newbie just purchased a 2004 S type 2.7 after driving several hundred miles trouble free till on a recent motorway had a small amber light intermittently flashing and a message  restricted performance the car is running fine performing as usual accelerates really well   on returning home plugged the OBD in no code showing took it out today for a run running really well same message again  am a bit stumped can understand if it was in limp mode any help would be most appreciated

Hi bob my stype is stuck in restricted performance and is restricted gets to 30 and starts to kill itself like fuel starvation cheers rik

Hi, Bob

if it’s working fine, there probably isn’t an issue. The car is either telling you there’s a fault, when there isn’t one (which I suppose is an annoying fault in itself); or there’s a minor intermittent fault that comes and goes. 
 

I found this info online: https://triangleimports.com/blog/why-does-my-jaguar-say-restricted-performance#:~:text=Common Restricted Performance Message Problems&text=Possible causes for the Restricted,and gaps in hose closures.

 

Sounds as though it could be caused by a loose connection or crack somewhere, probably caused by an inept mechanic. I recently acquired a 2004 S Type 2.7 myself and have found many such instances of ineptitude and negligence. It scares me to think what else is wrong that I’ve missed. At the moment, my Jag seems pretty sluggish. Dunno if I’m just expecting too much, she’s still half asleep, or if there are more issues, but she’s not as rapid as I expected her to be. She shines on motorways, but is sluggish at lower speeds. Thing that bothers me the most is when I try to accelerate from a standstill there’s a massive delay, and then she’s slow all the way to 50 or so. I recently discovered that the hose going to the coolant reservoir was reinstalled incorrectly and was leaking coolant everywhere. Beggars belief how some people become mechanics in the first place. 
 

Point being: it could easily be something as simple as a hose being reinstalled incorrectly, or maybe a worn or cracked part. 
 

Hope you find a solution. Keep us updated. 
 

All the best

Marty