The ABS fail illuminates in the panel, and obviously the skid warning as well.

I bought the car with this error, and a price accordingly, with the 'how hard can this be?´ .

Years ago I had a SEAT Altea with a similar fault, and it turned out to be rusty ABS rings on the rear axle. Actually the major fault then was, that the DSG gearbox could not shift correctly, as it could not figure out how fast the car was going.

Just before I rush to take it apart and buy sensors, - would this fault also most likely be the inexpensive rings being rusty?

The ABS sensors are only about £25 in the UK.

If you use FORScan it will tell you which sensor(s) needs replaced if that is in fact the problem.

All right then, replaced R/H rear sensor.

I cleared the fault and went for a long drive. Meanwhile the fault remained on the dash.

Sat and cleared the fault again, but cannot get rid of it.

One thing bothers me, how can it detect a fault on the rear right wheel, as it is stationary? I mean - the sensor is new, we cannot expect signals from the magnet ring in the hub, while I am parked. I imagine that the car must roll before the tester can hold running parameters against wrong/absent signals.

Any clues?

On 2/10/2026 at 5:42 PM, Donby said:

All right then, replaced R/H rear sensor.

I cleared the fault and went for a long drive. Meanwhile the fault remained on the dash.

Sat and cleared the fault again, but cannot get rid of it.

One thing bothers me, how can it detect a fault on the rear right wheel, as it is stationary? I mean - the sensor is new, we cannot expect signals from the magnet ring in the hub, while I am parked. I imagine that the car must roll before the tester can hold running parameters against wrong/absent signals.

Any clues?

Found out myself.

I bought the Fiesta during Christmas '25 and recalled that there had been a mouse in the car. Then it struck me that I found a bit of wire, as I cleaned the cabin.

SO - traced the wire from R/H ABS sensor, and found the loom under the R/H panel on the back seat. There I found clear evidence of a 'mouse meal', as 2-3 centimeters of the sensor wires were missing! Also the wires for light in the trunk were damaged, allthough I had not notised.

Back seats in a Fiesta is a nightmare, but the wire repair was an easy fix, - the 3+ decades avionics technician (moi) say