Hi,

Not having much joy resolving my ABS issues. SKODA SUPERB (3V3) 2.0 TDI (110 kW / 150 hp), 2016, 150K miles

ABS issues started with poor battery on start, battery has been replaced and coded, issue remains.

Can see issue is with rear left, on my reader due to wheel speed being 1/3 the other wheels. Fault would appear after 25 meters of driving.

Replaced rear left sensor and wheel bearing (magnetic ring mostly disintegrated).

Now 0 wheel speed on rear left.

10.5 volts on FL, RR and RL, no great but others are still working.

Installed the new rear left bearing to rear right (with original sensor), can still get reading from rear right. Putting original rear right bearing on rear left, no reading. Doesn't seem to be an issue with wheel bearings magnetic ring.

Checked resistance from ABS cable to RR and RL sensors and get 1 ohm, not load tested. I doubt its the cable as was receiving a reading before.

Put the ABS cable back into the ABS module and then got a handbrake failure. Removed and re inserted the cable and issue remained (no damage to pins). Only disconnecting and reconnecting the battery a couple of times fixed it. (Removed battery to access ABS sensor)

At a bit of a loss as to what is causing the issue, looks like either the rear left sensor, harness or ABS module?

Will try using the rear left ABS sensor harness and connect it to the rear right and see if i can get a reading this way. To rule out the rear left wiring harness.

Using this replacement sensor, 412W0128 RIDEX ABS sensor Rear Axle both sides, without cable, Hall Sensor, 2-pin connector, 37,8mm, 75mm, D Shape | AUTODOC price and review

And another from GSF parts but no luck

Original sensor on rear right, has to drill our the rear left. So cant just swap them over

I’ve had 2 x new sensors in the past which turned out to be faulty - only buy reputable brands, costs more I agree but……..

Got this sensor from GSF, BREMI - Wheel Speed / ABS Sensor - Rear Part: BRM50321

BREMI - Wheel Speed / ABS Sensor - Rear | GSF Car Parts

To try and rule this out, didn't seem to make a difference. That was a £35 sensor

Seen a £90 Bosch sensor at eurocar parts, might give that a shot.

I will also try and see if my oscilloscope sees anything signal from them.

Give the cable a really thorough looking at, unplug it, manipulate it about a bit, looking for cracks. It's possible that the wires are starting the break up and it's only showing when the car's moving.