It's repairable if the break isn't right at the sensor (you'll need a continuity tester to locate the break, and basic wiring and soldering supplies to fix it), but it's kind of a PITA. If the break is right at the sensor, which is where it commonly happens, there's nothing to do but replace it.

If you bought it at the LBS, and especially if they installed it, I'd let them look at it. A neat installation is the key to long wire life....