Picked up a high mileage '04 Limited 4WD with the 3.0 for my son turning 16 soon. We've done quite a bit to get it ready for the road, but now having a problem diagnosing the brake light and ABS light. They come on randomly. Sometimes when starting to drive, there will be no lights on, then after a few minutes of driving the brake light and ABS light will turn on and stay on until the car is turned off again. Sometimes when it's started, it will have just the ABS light on, sometimes just the brake light, and sometimes both, and sometimes no lights. I have a scanner with ABS, and it shows no codes set for ABS. Fluid is full, and there are no leaks. Brakes seem to work fine, but I have not tested it hard while the lights are on. Where to start? Replace the brake level sensor maybe?