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Eventually convinced the garage to take look as they were adamant they did nothing wrong. As it transpires, they left a small pipe disconnected to the turbo. Problem solved.

I had personalised number plates on my car with my initials CSG on. So my XF is now called `Junior` after me.

Had the same probs plus parkbrake staying on. Check quality of battery connections at terminals and to bodywork including crimped cable to terminal lugs. How old is the battery? You can regularly charge an old battery and it seems Ok until the starter motor loads it. The Battery and its connection integrity are paramount on these cars.

My s type had a "restricted performance" a few weeks ago. After a few check ups and the fact that my electric key was not working at all I put the battery on my Ctek charger and left it overnight. The next morning the"Restricted Performance" disappeared and my Key was working properly. Batteries, even 3 years old ones, need a bit more attention Peter.

Help. After replacement of the alternator, I started getting the dreaded Restricted Performance warning. No fault codes showing up on my cheap Bluetooth adapter. At the time of replacement, mechanic suggested getting battery replaced. Thinking that would be the sensible thing to do on the basis that these cars are a bit suspectible to electronics, I replaced battery. Still getting the dreaded RP though. Would the battery monitoring system cause this? 2009 XF 3.0D Any help appreciated.