Toyota Land Cruiser Prado 90: Why Your ABS Light Stays On (Wheel Speed Sensor Focus)

Common Causes of a Continuous ABS Light

The most frequent culprit is a failed wheel speed sensor. These sensors, mounted at each wheel hub, measure wheel rotation and send signals to the ABS control module. Dirt, corrosion, or physical damage can interrupt the signal, triggering the warning light. Other possibilities include a damaged sensor wiring harness, a loose connector, or — less often — a faulty ABS module.

Which Sensors to Check First

Start with the front wheel speed sensors, as they are more exposed to road grime and impact. Examine the sensor tip for metal debris or rust buildup. Also inspect the wiring for chafing or breaks, especially near the suspension. Use a multimeter to measure resistance: a healthy sensor typically reads between 800–2000 ohms. If one sensor is out of spec, replace it.

Is It Safe to Keep Driving?

Yes, you can still drive with the ABS light on — standard braking functions are unaffected. However, the anti-lock brake system is disabled, meaning your wheels could lock up under hard braking, especially on wet or loose surfaces. Drive cautiously and avoid emergency stops until you fix the fault. For peace of mind, have the system diagnosed promptly.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.