2003 Volkswagen Passat abs and eps lights on dash

The a.b.s. system is not complicated,Its basically 4 sensor looking and monitering 4 toothed wheels,and a control unit. If u have replaced the hub and sensor.I would firstly check and clean, with electrical spray the connector onto your control module.If you want to check contiuety of the wiring you should be able to pick up the individual colours for wiring going to each sensor, Disconnect the control module, Bridge the connector with a paper clip at the particular wheel to be tested and using an ohms meter check the wiring.The reason for this is some a.b.s. sensors do not give continuety through them,But at least you will be able to see if wiring is okay.Alternativley you could run a twin core cable to the particular wheel sensor u think is faulty and chop and join the wires for this sensor at the abs module as it wold be temporay i would not wory about the routing of the cable i.e. taped to the car until test prove .Hope this helps