first find out which speed sensors are acting up, and if they still are acting up... once you know which ones are bad (if any), get the OE sensors - we had a few members here going with aftermarket sensors, just to find that the quality was sub-par, and eventually going for the OE.

To remove the sensor, you will need i think an allen wrench, i think metric #6 or so... don't hold me against these tools, but the removal of the sensor is rather simple, you take the wheel off, stick your hands in the back of the wheel hub and at 12 o'clock there should be a hole, which can be all gunked up, and in the hole there is a screw that holds the sensor - you can trace the location of the sensor by tracing the wire that is coming into the hub (all 4 wheels have a speed sensor, and only front left and rear right have a brake pad sensor, so in those locations you will see two sets of wires).


keep us posted of your progress