I've had my XF for more than a month now, I absolutely love the car but the Chrysler services is a big disappointment. I'm still waiting for my owner's manual and I have to figure out all the gadgets by reading this forum. I've just discovered where the coin box is but I still can't figure out what the FSS reading really mean. My current reading is - 248, can somebody please tell me what that means. BTW, the 3M plastic cleaner worked wonders ridding the haziness on the headlight.