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Why would the ABS light come on intermittently in your 1999 Ford Expedition?

Possible causes for an intermittently illuminated ABS light in a 1999 Ford Expedition include:

1. Faulty ABS wheel speed sensor: The wheel speed sensors are responsible for monitoring the speed of each wheel and sending this information to the ABS control module. If a sensor is faulty, the ABS light may illuminate intermittently.

2. Damaged or loose ABS wiring: The wiring harness that connects the ABS sensors to the ABS control module may become damaged or loose, causing the ABS light to illuminate intermittently.

3. Faulty ABS control module: The ABS control module is responsible for controlling the ABS system. If the control module is faulty, the ABS light may illuminate intermittently.

4. Low brake fluid level: A low brake fluid level can cause the ABS light to illuminate intermittently because the ABS system uses brake fluid to operate.

5. Wheel bearing issues: Worn or damaged wheel bearings can cause the ABS sensors to malfunction, leading to an intermittent ABS light.

6. Incorrect tire size: Using tires with a different size or type than what is specified by the manufacturer can cause the ABS system to malfunction, triggering the ABS light to come on intermittently.