ABS Light Stays On? Wheel Speed Sensor Troubles on Your Prado 150

Why Your ABS Light Is Staying On

If the ABS warning light on your Prado 150 stays lit continuously (not just during bulb check), it means the system has detected a fault and disabled itself. The most common culprit is a wheel speed sensor—either dirty, damaged, or failed. Other possibilities include a damaged tone ring, a wiring issue, or a failing ABS module, but the sensors are the best place to start.

Which Sensors to Check First

Start with the front sensors—they’re more exposed to road grime and debris. Check each sensor’s wiring near the wheel well for cuts, corrosion, or loose connections. A simple visual inspection often reveals trouble. Next, look at the tone ring (a toothed wheel behind the brake disc) for missing or bent teeth. If you have a multimeter, you can measure the sensor resistance (typically 1–2 kΩ) or use a scan tool to see which sensor isn’t producing a signal.

Is It Safe to Drive?

Yes, you can still drive—but with important caveats. The ABS, traction control, and vehicle stability control will be disabled. Your standard brakes work normally, so you can stop, but you may lose control during hard braking on slippery surfaces. Avoid aggressive driving and get the sensor fixed soon. Also, the check engine light may come on if the fault affects other systems. If the brake warning light (red circle) also stays on, stop driving immediately—that indicates a hydraulic problem.

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