I'm stumped.  Sent the whole arvo chasing the wires and there is no discernible break.  I've not been able to get my forearms behind the brake lines to remove the big connector to the abs and do some direct continuity testing but have just been out with an OBDEleven dongle plugged in to the car and can see that the ABS light comes on after a couple of minutes and that there is no discernible break whatsoever in transmission of the wheel speed data.  

I don't know whether the ABS will still work when the fault light is on (given that wheel speed is still being read) and I don't have any ideas as to what other fault finding I can do.  The ABS ECU unit looks tough to replace given its position.  and I've no idea in reality whether it is at fault.  Nor do I know whether the ABS ECU needs to be paired with the ECU if I change it, or whether the pairing is not a requirement in the mk1.  

 

stumped and not sure what a garage might do next either! 

sorry to re-raise an old thread - disaster has struck and I have to drive to the SW France next week.  I'd rather get the Fabia's ABS fixed before leaving so I'm going to try to get an original wheel speed sensor.  Does anyone know what the original part was branded?  Euro Car Parts have one made by Pagid.

2 hours ago, jpadie said:

sorry to re-raise an old thread - disaster has struck and I have to drive to the SW France next week.  I'd rather get the Fabia's ABS fixed before leaving so I'm going to try to get an original wheel speed sensor.  Does anyone know what the original part was branded?  Euro Car Parts have one made by Pagid.

 

That'll do, Pagid are an OEM so you'll be just fine.

thanks @sepulchrave

 

got it this morning and when I went to fit it the bolt sheared off.  can't get a drill bit into that area so the sensor got glued on with CT1 and mitre bond.  if that doesn't work then I think I have to replace the whole wheel hub!  

I don't know if it's relevant but I had a problem with a Yamaha FJR 1300 where the ABS light would light consistently at 70 mph. I took the mounting bolt out to find the sensor seized solidly in the housing so I warmed it up and soaked it in penetrating oil but it wouldn't move so I left the bolt out thinking that it might work free in time as I rode the bike. It didn't, but the light didn't come on again so I replaced the bolt slightly looser thinking that maybe the bolt was distorting the sensor body and the light came back on. I the then fitted a plastic bolt (for effect for the MOT!) The light didn't play up for 3 years until the sensor completely failed and I had to break it out. New sensor, problem solved. The diagnostics said "rear sensor" so I had a good idea from the outset where the fault lay.

 

25 minutes ago, grumpy1 said:

I don't know if it's relevant but I had a problem with a Yamaha FJR 1300 where the ABS light would light consistently at 70 mph. I took the mounting bolt out to find the sensor seized solidly in the housing so I warmed it up and soaked it in penetrating oil but it wouldn't move so I left the bolt out thinking that it might work free in time as I rode the bike. It didn't, but the light didn't come on again so I replaced the bolt slightly looser thinking that maybe the bolt was distorting the sensor body and the light came back on. I the then fitted a plastic bolt (for effect for the MOT!) The light didn't play up for 3 years until the sensor completely failed and I had to break it out. New sensor, problem solved. The diagnostics said "rear sensor" so I had a good idea from the outset where the fault lay.

 

 

That's amazing!