when you say ABS sensors, do you mean brake sensors (one front left, one rear right), or speed sensors (one at all 4 corners)?

the brake sensors are a simple electrical loop that once cut through by the reduced material of the brake pad, opens up an elecrical circuit and sets off a "brake pad worn" indicator. once the pads are replaced and new sensors are fitted, the warning goes away in a few moments.

The speed sensors are Hall Effect sensors that use touchless magnetic field from the wheels and they generate square pulses that are read by the ABS module in the engine compartment, compared from each corner and then the ABS module reports the speed into the car's iBus, where it is used to control the speedo ( a specific sensor), the odo, the engine's RPMs, the speed of the windhsield wipers, the volume of the radio, the TV function... when replaced, no coding is needed... the sensor operates as a diode - current passes in one direction and not in the other...

if you put a "dent" into a Hall Effect sensor, you may have damaged the diode inside... test it - do you have a multimeter with diode function?