Symptoms
ABS, TC and HDC warning lights on together, sometimes intermittently.
The fix, step by step
- Read the codes with a Nanocom, Hawkeye or similar to find the wheel.
- Clean the sensor and its tone ring, check the wiring and connector, and replace the sensor if needed.
- Play in a front wheel bearing can also trigger the lights; the front bearing is part of the hub assembly, and the hub nut is torqued to 490 Nm (360 lb-ft).
- If the codes point to the modulator, check for the 2004 NHTSA modulator-cover recall and change the brake fluid before replacing the unit.
Tools & part numbers
- Diagnostic tool, multimeter, big torque wrench for hubs
- wheel-speed sensors, hub assembly
Where to buy the parts
SSW500020 front wheel speed sensor, Discovery 2LR Direct ↗Amazon ↗
SSW500030 rear wheel speed sensor, Discovery 2LR Direct ↗Amazon ↗
TAY100060 front hub assembly with ABS sensorLR Direct ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Land Rover Discovery Series II parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.