: With the ignition on and reverse gear engaged, listen closely to each sensor; a working sensor typically emits a faint "clicking" sound. Check Battery Health
Another documented meaning of B123A relates to the vehicle's core electrical system. On certain Renault and Dacia models, diagnostic data from the or the Tire Pressure Monitoring System has logged B123A to indicate a "12V Battery Pack Voltage" issue. dtc b123a renault link
Battery light ON, Stop Light ON, Start-Stop system deactivated, sometimes failure to start. : With the ignition on and reverse gear