Road speed sensor
â–¶ How to fix
Check the cable harness and connectors.Check the road speed sensor.Check pin B3 on the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The speed signal from the speed sensor has been lost.
Possible cause
Short circuit or open circuit in the cable harness between the road speed sensor and tachograph.Internal fault in the road speed sensor.Fault in the tachograph.