hi ken. i bought mine from local dealer came with years warrnty. and basicly the only trouble that i had was the parking sensors (rear) the front never had any probs with it was always the rear ones. the first one went, and took it to them they told me that wen one goes usually more go they seem to work in a chain link like christmas tree lights. they replaced the one that had gone 2weeks later the prob comes back it goes back in gets no2 replaced 2-3 weeks later no 3 rear goes and by this time im fumming coz my car before that was an x5 plagued with elec probs lost a fortune on getting rid of it then got the xk so i voiced my opinion to the service manager. who told me they would keep it and put it on thier diaognostic machine all nite and also replace it first and check the wiring loom. i got it back and alls been fine for about a year now. but ive heard on the site they are a prob across the jaguar range xf, xj,stype ect they seem to play up in the rain frost ect. my advice to you is to take it to a recomended indy jag specalists near you their is a list off them on this site recomended by other owners get them to replace it and ask them or tell them what ive told you about wen one goes others go to and ask them to check over your wiring loom to try and prevent it happining again. i dont thing they are expensive to buy ive seen them on ebay about £20 but then your charged for fitting. to engage the front parking sensors thier is a black button with a very small light on it if for example you are in drive and you are going into a parking space press the button that actavates the front sensors. ive never heard of any one complaining about them its allways the rear hope this has been helpfull regards charlie