Why is my ABS warning light on?
The ABS warning light means the anti-lock braking system has a fault and is currently disabled. Your normal brakes still work, but you will not have ABS assistance in an emergency stop — the wheels may lock. The most common cause is a faulty ABS wheel speed sensor, which is a relatively inexpensive repair. You can typically still drive carefully to a garage.
Likely causes
Faulty ABS wheel speed sensor
Very common — one of the four sensors fails and disables the whole system
Damaged ABS sensor wiring
Wiring can be damaged by road debris or corrosion
ABS pump or module fault
More expensive — rare on modern vehicles
Low brake fluid level
Sometimes triggers ABS light alongside brake warning
Repairs you may need
Typical cost range: £60–£300 — ABS sensor replacement £80–200 per sensor. Diagnostic to confirm which sensor is faulty: £40–80.
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