What's the 13 1 Honda code?

It'd help to know what year and model Honda You've got, but in general, a diagnostic trouble code of 13-1 is going to be related to the ABS, and translates to Left Front Wheel Sensor Open or Short. This can actually trigger due to a wheel bearing going, though it could also be exactly what it says: There's a cut wire or wire going to ground that's connected to the sensor on the left front wheel. You should check for broken, bent, pushed out or corroded connector pins here. If Your ABS light is also on, You don't have a functioning anti-lock brake system, which is a safety hazard, so definitely bring this into the shop, if it's not something that's merely loose (which You find on Your visual inspection).