wheel speed sensor
 

Hello, have just been informed that my o/s front wheel speed sensor has had it consequently I've got ABS ESP BAS, warning lights. What I was wondering was whether I could refit this myself or is there some electronics/electrics which would need a specialist. Also are they interchangeable and easy to come by, or is a genuine part a must. Lastly is leaving this until after Christmas likely to cause any problems.

Thanks in advance Gareth.