Car symptom
ABS warning light on
A lit ABS light means the anti-lock braking system is disabled - normal braking usually still works, but get it checked.
Most likely causes
- Wheel speed sensor or ring
- Damaged wiring / connector
- ABS module fault
- Low or contaminated brake fluid
Checks to run
- Read the ABS codes
- Inspect each wheel speed sensor and ring
- Check the wiring and fluid
Tools you may need
OBD-II scanner
Multimeter
Confirm before replacing. These are hypotheses to check — never buy parts on a guess. If the fault involves brakes, airbags or fuel under pressure, use a professional.
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FAQ
It depends on the cause. Some causes are cheap and quick; others (like a head gasket or seized caliper) need attention soon. Work through the checks in order and confirm before replacing parts.
Start with the free checks listed here. If they involve high voltage, fuel under pressure, airbags or brakes, let a professional handle it.
The interactive diagnostic asks targeted questions to narrow it down, and every cause must be confirmed with a measurement — never guess.