Electrical · Thornton Heath CR7

ABS Sensor Replacement for Thornton Heath Drivers

From Thornton Heath it's about 15 minutes to our workshop, via the Lombard roundabout and across Mitcham Common to Hackbridge. We diagnose the ABS fault properly before quoting, checking the sensor, wiring and ring, and ABS sensor replacement starts from £89.

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~15 min from Thornton Heath
Mon–Sat 8am–8pm

Audi SQ5 in for brake and wheel-speed work at KITH Cars Garage & Bodyworks, Hackbridge

ABS Sensor Replacement for Thornton Heath drivers

Buses, bus lanes and sudden stops around the Clock Tower

Thornton Heath has some of the busiest bus corridors in the area. London Road, Brigstock Road and the High Street around the Clock Tower see buses pulling in and out all day, and Thornton Road between Thornton Heath Pond and the Lombard roundabout queues at peak times. Stop-start driving like this brings plenty of sudden braking, often in the wet. ABS and stability control help you stop in a straight line and steer at the same time, and when a wheel speed sensor fails, both are switched off.

Many cars in Thornton Heath are older petrol and diesels, along with high-mileage private-hire cars, and both tend to suffer ABS faults. On older cars, years of road spray and salt corrode the sensor into the hub, and the wiring hardens and cracks where it flexes. On private-hire cars, frequent brake work means sensors get disturbed more often. In the narrow terraces of West Thornton, tight parking and kerb knocks can damage a sensor or its wiring too.

When the car arrives, we read the ABS module to find the wheel and type of fault, compare live wheel speeds and test the sensor circuit. If the sensor is seized, we remove it carefully and clean the hub before fitting the new one at the right gap. We check the reluctor ring or bearing encoder for damage too. You'll get a written quote explaining the cause, and we fit OE or OE-equivalent parts.

The route is Thornton Road to the Lombard roundabout, then the A236 west past Therapia Lane and across Mitcham Common, turning left onto Carshalton Road into Hackbridge, about 5 miles. With only the ABS light on, most cars can be driven here carefully. On Crystal Palace home match days, allow for road closures near Selhurst Park. The repair is covered by our 3-month workmanship warranty.

Electrical

ABS Sensor Replacement: what’s involved

Each wheel has a speed sensor that reads a toothed or magnetic ring turning with the hub or driveshaft. The ABS module constantly compares the four signals. If one wheel slows too quickly under braking, the system releases and reapplies that brake to stop it locking. The same signals feed traction control, stability control and often the speedometer, hill-hold and tyre pressure warning.

Older cars use passive sensors that generate their own signal. Most modern cars use active sensors, which are powered by the ABS module and often read a magnetic encoder built into the wheel bearing seal. Sensors sit right next to the brakes, exposed to heat, water, salt and brake dust, so corrosion, damaged wiring and failed connectors are common. When a signal drops out, the system switches ABS and stability control off and lights the warning. Your normal brakes still work.

From £89Written quote first

45 minutes–2 hoursTypical time in the workshop

3 monthsWorkmanship warranty

4.9★87 Google reviews

Signs of an ABS sensor fault

ABS warning light on

A steady ABS light means the system has switched itself off. Normal braking still works, but the wheels can lock under heavy braking.

Traction and stability lights too

Because they rely on the same wheel speed signals, the traction control or ESP light usually comes on with the ABS light.

Light comes and goes

An intermittent warning, often after bumps, in wet weather or at a certain speed, usually points to damaged wiring, a loose connector or a corroded sensor.

ABS pulsing at low speed

If the pedal pulses and the ABS activates when stopping gently, a sensor may be giving a false reading from a dirty sensor or a cracked reluctor ring.

Speedometer or tyre warning faults

On cars that take road speed or tyre pressure monitoring from the wheel sensors, a faulty sensor can upset the speedometer or set a tyre warning.

Other systems disabled

Hill-hold, cruise control, stop-start and some electric parking brake functions may stop working when a wheel speed signal is missing.

When should it be done?

ABS sensors have no replacement interval. They are replaced when they fail or when their wiring is damaged. Get the car checked as soon as the ABS light comes on, because the car won't stop as well in an emergency on a wet road without ABS and stability control. An ABS warning light that stays on is also an MOT failure. Faults often show up after brake, hub or suspension work, when a sensor or its wiring may have been disturbed.

ABS, traction or stability warning light on
Intermittent warnings in wet weather or over bumps
Warning lights after brake, wheel bearing or suspension work
Before an MOT if the ABS light is showing

How we replace an ABS sensor

Check-in and symptomsWe ask when the light appears and whether any work has been done recently, as disturbed wiring after brake or suspension work is common.
Diagnostic scanWe read the ABS module fault codes to identify which wheel is affected and whether the fault is signal, circuit or plausibility related.
Live data and testingWe compare live wheel speed readings on a road test or ramp and test the sensor circuit with a multimeter or oscilloscope to separate sensor, wiring and ring faults.
Inspect the ring and bearingWe check the reluctor ring or magnetic encoder for cracks, corrosion or damage and check the wheel bearing for play, as either can cause a false signal.
Written quoteWe explain the cause and give you a written quote. If the encoder is built into the wheel bearing, we'll explain why the bearing may need replacing.
Replace the sensorWe carefully remove the old sensor, which is often seized in the hub, clean the mounting, and fit the new sensor with its wiring routed and secured correctly.
Clear codes and road testWe clear the fault codes, road test to confirm all four wheel speeds read correctly and the warning lights stay off, and run any calibration the car needs.

Parts we fit

Sensors must match the car exactly. Active and passive types are not interchangeable, and connectors and lengths vary between models and even between axles. We fit OE or OE-equivalent sensors from manufacturers such as Bosch, ATE or Continental. Where the wiring is damaged we repair it properly with sealed connectors, and where the fault is in a reluctor ring or a wheel bearing encoder, we replace that part rather than just the sensor.

OE or OE-equivalent ABS wheel speed sensors
Reluctor rings where cracked or corroded
Wheel bearings with integral magnetic encoders where required
Sensor wiring and sealed connector repairs

How long it takes

45 minutes–2 hours

A straightforward sensor swap often takes under an hour. Seized sensors, wiring repairs or a reluctor ring or wheel bearing replacement take longer. Most jobs are completed the same day.

What’s included

ABS system fault code scan
Wheel speed live data check
Sensor circuit and reluctor ring inspection
Correct replacement sensor fitted
Fault codes cleared
Road test to confirm the warning lights stay off

Getting here from Thornton Heath

From Thornton Heath to our Hackbridge workshop

Head to Thornton Heath Pond and take Thornton Road (A23) south-west to the Lombard roundabout, then take Mitcham Road (A236) west past Therapia Lane, continuing as Croydon Road (A236) across Mitcham Common. At the roundabout with the A237 turn left onto Carshalton Road, which becomes London Road (A237) through Hackbridge, where Soho Mills is on the left.

Head to the Lombard roundabout, then the A236 across Mitcham Common and Carshalton Road to Hackbridge, about 15 minutes. With only the ABS light on, drive gently.

Directions from Thornton Heath

About Thornton Heath

Thornton Heath is a busy, densely built district about 1.5 miles north of Croydon town centre, made up largely of Victorian and Edwardian terraced streets that grew up around the railway and the trams in the late 1800s and early 1900s. It has a lively high street of independent shops and food outlets around the 1900 clock tower. Driving here means narrow terraced roads lined with parked cars on both sides, a constant flow of buses, and queues on the A23 around Thornton Heath Pond.

Places nearby: Thornton Heath Clock Tower, Thornton Heath Pond, Croydon University Hospital, Grangewood Park, Thornton Heath Recreation Ground, Thornton Heath Library

Postcodes: CR7, CR0 · London Borough of Croydon

More about KITH for Thornton Heath drivers

Questions

ABS Sensor Replacement in Thornton Heath: your questions answered

My older car's ABS sensor is seized. Can it still be replaced?

Usually, yes. We use penetrating oil, heat where safe and careful extraction, and occasionally a sensor has to be drilled out. We'll warn you if yours looks badly seized and include that in the quote.

Why does the ABS light come on when I brake behind buses?

If the light appears under braking, the ABS module may be seeing a wheel speed signal that doesn't match the others, often from a dirty or cracked reluctor ring or a weak sensor. We compare all four wheel speeds live to find it.

Can you collect my car from Thornton Heath?

Yes, collection and delivery can be arranged locally. If the car is parked near Selhurst Park, tell us, so we can avoid match day closures.

Is it safe to drive with the ABS light on?

The car will still brake normally, so you can usually drive it carefully to the garage. But without ABS and stability control the wheels can lock under hard braking, so leave extra distance. If the brake warning light is on as well, get advice before driving.

Will an ABS light fail the MOT?

Yes. An ABS warning light that stays on, or doesn't come on when the ignition is switched on, is an MOT failure. The same applies to the electronic stability control warning on cars that have it.

Can I just clear the code?

If the fault is still there, the ABS module will find it again, usually within a short drive. Clearing codes without finding the cause just delays the repair.

Why might I need a wheel bearing as well?

On many modern cars the magnetic ring that the sensor reads is built into the wheel bearing seal. If that encoder is damaged or the bearing has excessive play, a new sensor won't cure the fault, and the bearing has to be replaced.

Why did the light come on after my brakes were done?

ABS sensors and their wiring sit close to the brakes and hubs, so they can be knocked, stretched or left unplugged during brake or suspension work. Sometimes an old sensor that was already corroded fails when disturbed. A quick scan shows which wheel is affected.

Instant quote

Price your ABS sensor replacement now

Enter your reg and we’ll look up your car and price the job from our own labour rates and the book time for your model. Then book it in with a fixed written quote before any work starts.

Free, about 30 seconds, no sign-up
Parts, labour and VAT included
3-month workmanship warranty
Collection from Thornton Heath can be arranged

“It’s rare to find a garage you can truly trust. Fair price, brilliant customer service.”Thinushan K. · ★★★★★ Google

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