See also:

Automatic relocking
If the doors are unlocked, the locks will automatically reengage (re-lock) and the alarm will rearm after 2 minutes unless a door or the tailgate has been opened. ...

BRAKE – Brake failure warning light
If the light comes on while driving or braking, stop immediately, open the hood and check the brake fluid level in the reservoir. Canadian models are equipped with this warning light. ...

Deposit control gasoline (detergent additives)
Volvo recommends the use of detergent gasoline to control engine deposits. Detergent gasoline is effective in keeping injectors and intake valves clean. Consistent use of deposit control gasol ...