After replacing my OVP, which caused the ABS light to constantly stay on, the light is off everytime I start my car. However, as soon as I start moving forward, the light comes on and stays on until I shut off my car and restart it, and then as soon as I start moving, it comes on again. Therefore, I think its a sensor problem. I've unplugged both front sensors and rinsed them off with brake cleaner fluid, and they were both already pretty clean except for a little grease. Cleaning the front sensors did nothing. Could it be the rear sensor that's causing the trouble? I have a multimeter, but how do I use it to test the sensor to see if it's operational? I checked the diode measurement in the front ones at the plugs and they both read about the same number, but am I even supposed to use the diode function of the multimeter when testing the sensors? Also, where would I find the rear sensor's plug to test it? And could it be a different problem altogether and have nothing to do with the sensors? Thanks.