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Ian21401 · Mar 30th, 2021, 10:56

The sender unit located in the differential is also the rear ABS sensor. If your ABS fault warning light extinguishes once the car is moving then the sender unit is probably OK. Most of the faults as you describe are caused by the instrument cluster PCB, it’s connections or the speedo. condensers or a combination of all those.
There are many useful threads regarding speedometer problems. Try searching in this section.
Questions, Year and model of your car, and
The make of your speedo. Yazaki or VDO.

Mar 30th, 2021, 10:56	#2
Ian21401 Premier Member Last Online: Feb 11th, 2023 20:32 Join Date: May 2010 Location: Blyth, Northumberland	The sender unit located in the differential is also the rear ABS sensor. If your ABS fault warning light extinguishes once the car is moving then the sender unit is probably OK. Most of the faults as you describe are caused by the instrument cluster PCB, it’s connections or the speedo. condensers or a combination of all those. There are many useful threads regarding speedometer problems. Try searching in this section. Questions, Year and model of your car, and The make of your speedo. Yazaki or VDO. __________________ Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse. Last edited by Ian21401; Mar 30th, 2021 at 11:12.