Hi, I have just changed all my Shocks, Springs and wheel bearings, but I have just taken it out for a test drive and the ABS / Traction control light has come on.

N.B. when I reassembled the front hubs I had great difficulty in replacing the front ABS sensors, it seamed that there wasn't enough room to push the sensors back in, so I shaved off some of the plastic and accidentily exposed some metal parts, however the sensors now fitted quite easily.

Questions...does the sensor need to be really tight when in place?
Does it matter if there is some metal exposed on the sensor?
Is this a comon issue of the sensor being difficult to fit?