2002 jaguar x type code c1266

This code is not in the list of jaguar codes so i would suggest you ask the mechanic what this means ,This year car is basically a ford mondeo with a different body shape ,its value now is not a lot if its a petrol model maybe a 1000 euros tops but a diesel manual is another proposition ,anyway your problem here i think is a wheel sensor or the magnetic painted path on the back of the wheel bearing ,it will need checking out with a automotive multimeter to locate the fault trying to read a code will not tell you what wheel sensor is faulty and the another thing the ABS computer is the only electronics on the car that will reset itself once the fault is found and cured