Pheew
Glad you finally connected.
You need to remove front left wheel and before disconnecting any connector you need to thoroughly check all the wires for damage, chaffing, hardened/brittle cable outer casings.
If all goes well then it is time to disconnect the wheel sensor connector. Examine closely. If all still look good then I would clean with alcohol and a tooth brush the cable connectors and then lube them with a little WD40 or better still contact/switch clean and lube fluid available from Maplins or Radio Spares or Farnell.
If you have a multimeter then I would check the resistance of the wheel sensor coil and compare this with the other front side. If the are similar then thingsd are looking good. Reconnect everything, reset error code and go for test drive.
Fingers crossed all will be OK.
If it transpires that the front wheel sensor ring has failed then these are not replaceable as they come built into the hub assembly. The hubs however are relatively cheep and you get a new wheels bearing into the bargain.