* Low brake fluid: This is the most common and easiest to check. Simply locate your brake fluid reservoir (usually a clear or translucent container) and see if the fluid level is low. If it is, you need to have it topped off immediately and investigate the reason for the leak.
* Faulty ABS sensor: These sensors monitor wheel speed. A faulty sensor will trigger the warning light. They can be damaged from impacts, corrosion, or simply wear out. This requires diagnostic testing to pinpoint which sensor is at fault.
* Faulty ABS control module: This is the "brain" of the ABS system. It's a more expensive repair, often requiring replacement. Again, diagnostic testing is necessary.
* Wiring issues: Damaged or corroded wiring to the sensors or the control module can cause problems.
* Faulty ABS pump motor: Less common, but possible.
* Low tire pressure: While less directly related, significantly different tire pressures between wheels can trigger the ABS light. Check your tire pressures.
What you should do:
1. Check your brake fluid level immediately. If it's low, *do not drive the car* until you've determined the cause of the leak and had it repaired.
2. Have the car scanned for diagnostic trouble codes (DTCs). A code reader (available at auto parts stores) or a mechanic can read the codes stored by the ABS system. This will pinpoint the most likely culprit.
3. Don't ignore the light. Driving with a malfunctioning ABS system means you'll lose the anti-lock braking function. While you can still brake, it might be harder to control the car in an emergency stop, especially on slick surfaces.
In short, don't panic, but do take action. Get the car diagnosed promptly to determine the exact cause and prevent further complications or accidents.
