Here are the most common culprits:
* Low Brake Fluid: This is the first thing to check. Low fluid can indicate a leak somewhere in the brake system, which can affect ABS functionality.
* Faulty ABS Wheel Speed Sensor(s): These sensors monitor wheel speed and are crucial for both ABS and traction control. A faulty sensor will cause inaccurate speed readings, triggering the warning lights. This is a very common cause.
* Bad ABS Module: The ABS module is the computer that controls the entire system. A malfunctioning module can cause a range of issues, including these warning lights. This is a more expensive repair.
* Faulty Wiring or Connectors: Damaged wiring or corroded connectors within the ABS system can disrupt communication and cause the lights to illuminate.
* Brake System Malfunction: Although less likely to trigger *both* lights directly, a significant brake system problem could indirectly cause the ABS system to shut down and illuminate both warning lights as a safety precaution.
What you should do:
1. Check brake fluid level immediately. If it's low, address the leak *before* driving any further.
2. Have the vehicle scanned with an OBD-II code reader. This will give you specific trouble codes that will help pinpoint the exact problem. Auto parts stores often offer free code reading services.
3. Consult a qualified mechanic. Based on the code(s) and your visual inspection, a mechanic can diagnose the issue and perform the necessary repairs.
Driving with these lights on means your ABS and traction control are not functioning, significantly reducing your braking ability and control, especially in slippery conditions. It's crucial to have this addressed promptly for safety reasons.
