For information really and you may get the same fault - who knows !

Had an interesting one into the workshop today.
ABS, TC and HDC all lit up. With Engine management light too.

Several faults I think to myself.
ABS fault codes; C1067 Right Rear Sensor, C1051 Left Front Sensor, C1035 Right Front Sensor, C1019 Left Front Sensor.

Could lead you to think the ABS ECU / modulator is broken, however, out with the PScan. Live data and monitored wheel speed. 3 wheels agreed, Left Front was 0 KPH.

Changed LH Front sensor having had to touch the bolt with a mini grinder to take the rust off which would have allowed an 8mm six sided socket to turn as the rust flaked off. I then fitted a 7mm socket and unscrewed it.

This sensor change removed all lights and the speed on all wheels agreed.

So what of the Engine Management light - here is another surprise. On the Engine ECU (TD4) there was fault code P0500 - Vehicle Speed Error.

So that cleared too.

I would never have put the two faults together, neither would most garages spot that one sensor was causing all the fault codes.

Maybe the LH Front sensor has a 'special' role and if missing causes the system to loose reference ??

Might be handy and interest someone ??

Everyday is a school day !!

Thanks Andy - good to know this

Yes- can imagine a garage changing ABS Modulator and / or all sensors and chewing the bolt off at the sensor and then fitting a new hub. £3k at least !!!

I would imagine something has happened historically that caused the 4 sensors to fault/drop. That would have given a speed related error and faults for all 4 sensors.

No wasn't strangely. Should have made that clear. I cleared all faults before the vehicle was then driven to me for a fresh set of data.