The ABS sensors on a 2001 Dodge Grand Caravan are located at each wheel. There's one sensor per wheel – front left, front right, rear left, and rear right. They're typically mounted within the wheel hub assembly or very near it. To pinpoint the exact location, you'll need a repair manual specific to your year and model Grand Caravan. A Chilton's or Haynes manual will show diagrams and provide detailed instructions. You can also consult online repair databases, though access may require a subscription fee.
Because of the potential for variation depending on trim level and specific options, relying on a picture online for a specific location is risky. Using a repair manual is highly recommended to avoid damaging other components.
