Road speed sensor
Check if the vehicle has been exposed to vibrations Check the road speed sensor and cable harness. Renew the road speed sensor if it is defective. Check if there are indications that the road speed sensor has been manipulated in a prohibited manner. Check if the speed signals come from the contact on the front of the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Speed signals have been shown when the starter key has not been in the drive position.
Small movements of a parked vehicle (e.g. if the vehicle is on a ferry or is hit by hard wind) could cause impulses from the road speed sensor. Other fault causes: Fault in the cable harness Fault in the road speed sensor The vehicle has been towed