Your anti-lock braking system has a fault and is disabled. Normal brakes still work, but you lose ABS, traction control, and often stability control.
Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.
Common causes
Failed wheel speed sensor (most common), damaged sensor wiring, low brake fluid, faulty ABS pump or module, or a blown ABS fuse. A diagnostic scan identifies which wheel/circuit is at fault.
Can I still drive?
Yes — your normal hydraulic brakes are unaffected. But stopping distances increase in slippery conditions because the wheels can lock up. Get it checked within a week, sooner if winter.
Repair costs UK
Wheel speed sensor: £80–£180 fitted. ABS module repair or replacement: £250–£900. Always insist on a proper scan before parts are replaced.
My ABS light is on, but my brakes feel fine. Can I still drive my car? — Driving with the ABS light on is risky, even if your brakes feel normal. The ABS system is designed to prevent wheel lock-up during emergency braking, and without it, your car could skid uncontrollably. While your regular braking might work, you'll lose that crucial safety net. Get it checked by a mechanic as soon as possible. It could be a simple sensor fault, but ignoring it puts you and others at risk, especially in wet conditions. Don't gamble with your safety.
What are the common reasons an ABS light comes on, and how much does it usually cost to fix? — The most common culprits for an illuminated ABS light are faulty wheel speed sensors, a broken ABS reluctor ring, or a problem with the ABS control module. A sensor replacement is often the cheapest fix, typically costing £80-£200 including labour. A reluctor ring can be similar, sometimes requiring a new drive shaft if it's integrated. A new ABS module is the priciest, potentially running from £400 up to £1000+ depending on the car. Diagnostic fees usually apply, around £50-£100, to pinpoint the exact issue.
Will my car fail its MOT if the ABS warning light is on? — Yes, absolutely. An illuminated ABS warning light is an automatic MOT failure. The MOT test specifically checks that all mandatory warning lights, including the ABS light, are not showing any faults. This is because a non-functional ABS system is a significant safety hazard. You won't be able to get your car re-tested and passed until the underlying issue is diagnosed and repaired, and the light is off. Don't even bother taking it for an MOT with that light on.
My ABS light is on, but my brakes feel fine. Can I still drive the car? — While your brakes might feel normal, the ABS system itself isn't working, meaning you've lost that crucial anti-lock braking function. In an emergency stop, your wheels could lock up, leading to a loss of steering control. It's not immediately catastrophic, but it's a significant safety risk, especially in wet or icy conditions. Get it checked by a mechanic as soon as possible. Driving with a faulty ABS system can also be an MOT failure, so don't put it off.
What's the most common reason for the ABS light to come on, and what should I check myself? — The most common culprit is a faulty wheel speed sensor. These small sensors, located near each wheel, tell the ABS module how fast each wheel is spinning. They can get dirty, damaged, or simply fail. You can visually inspect the sensors and their wiring for obvious damage or disconnections, but don't try to clean them with harsh chemicals. Another common issue is a blown ABS fuse. Check your car's fuse box diagram for the ABS fuse and see if it's intact. If not, replacing it might solve the problem, but if it blows again, there's a deeper electrical fault.
How much does it typically cost to fix an ABS light issue, and what's involved in the repair? — The cost varies greatly depending on the fault. A new wheel speed sensor can range from £30-£100 for the part, plus an hour or two of labour (around £50-£150). A faulty ABS module, however, is a much bigger job, costing anywhere from £300 to over £1000 for parts and labour, as it's a complex computer unit. Diagnosing the exact fault usually involves plugging a diagnostic scanner into your car's OBD-II port to read fault codes, which typically costs around £40-£80. Always get a clear diagnosis before authorising expensive repairs.
My ABS light just flickered on and off. Should I be worried, or is it a glitch? — Even a flicker means something's not quite right with your ABS system. Don't ignore it. It could be a loose connection, a faulty wheel speed sensor playing up, or even low brake fluid. While it might clear itself, it's best to get it checked. If it comes back on, your ABS isn't working as it should, which is dangerous, especially in an emergency stop. Get a diagnostic scan done to pinpoint the exact issue before it gets worse or causes an MOT failure.
How much does it typically cost to fix an ABS light issue, and what parts are usually involved? — Costs vary, but expect anything from £50 for a simple sensor clean to several hundred for a new ABS module. Common culprits include a faulty wheel speed sensor (around £50-£150 per sensor, plus labour), damaged ABS wiring, or a low brake fluid level (a cheaper fix). The most expensive repair is usually a new ABS pump or control module, which can run into £500-£1500, including fitting. A diagnostic scan (around £40-£80) is the first step to identify the specific part needing attention.
Can I still drive with the ABS light on, and will it fail my MOT? — Technically, you can drive, but your car's ABS won't function, meaning your wheels could lock up under hard braking. This significantly increases your stopping distance and risk of skidding, especially in wet conditions. Critically, a lit ABS warning light is an automatic MOT failure. It indicates a significant safety defect. Get it sorted before your MOT is due, otherwise, you'll be looking at a retest and potentially bigger repair bills if you leave it too long.
Will ABS light cause MOT failure? — Yes — since 2012 a permanently lit ABS warning lamp is an MOT failure.