Code 3: Left Front Seat Belt PRETENSIONER Fault: Description
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Air bag diagnostic monitor checks left front seat belt pretensioner circuits for faults. If the air bag diagnostic monitor detects an unexpected condition on left front seat belt pretensioner circuits, it will flash Code 3 on AIR BAG warning light.