Ford Flex Warning Lights: What They Mean

Red: stop or act now

Brake System

Parking brake is engaged, or if lit while moving with brake released, brake fluid is low or the brake system has a fault.
What to do: Make sure the parking brake is released; if still on, have the vehicle checked immediately. PDF page 95

Other warnings and indicators

Engine Coolant Temperature

Engine coolant temperature is high.
What to do: Stop as soon as possible, switch off the engine and let it cool. PDF page 95

Charging System

Battery is not charging properly; possible charging system or electrical malfunction.
What to do: Contact your authorized dealer as soon as possible. PDF page 95

Battery

If lit while driving, indicates a malfunction.
What to do: Switch off unnecessary electrical equipment and have the system checked by your dealer immediately. PDF page 95

Airbag Readiness

Malfunction if it fails to light at ignition on, keeps flashing or stays on; a tone sounds.
What to do: Have the system checked by your authorized dealer. PDF page 95

Anti-Lock Braking System

Malfunction in the ABS when lit while driving; normal braking remains unless brake warning lamp is also on.
What to do: Have the system checked by your authorized dealer. PDF page 95

Service Engine Soon Indicator

The OBD-II system has detected an emission-related malfunction, which may be temporary such as from a loose fuel cap or poor fuel.
What to do: If it remains on, have the vehicle serviced at the first available opportunity. PDF page 163

Stability and traction control light

Flashes when the systems activate; stays steadily lit if a problem occurs in either system.
What to do: Check traction control was not switched off; if still lit, have it serviced by a dealer immediately. PDF page 178

Low tire pressure warning light

Tire pressure is significantly low; if it flashes about a minute then stays on, the TPMS is malfunctioning. PDF page 293

Seatbelt Warning Lamp

Driver seatbelt is not fastened when ignition is turned on; chime also sounds.
What to do: Buckle the driver seatbelt to turn off the light and chime. PDF page 42

Door Ajar

Ignition is on and a door is not completely closed. PDF page 95

Directional Indicator

Left or right turn signal or hazard flasher is on; staying on or flashing faster suggests a burned-out bulb.
What to do: Check for a burned-out bulb. PDF page 95

Stability and traction control off light

Comes on at engine start-up and stays on when traction control is switched off. PDF page 178

Passenger airbag status indicator

OFF lit means passenger frontal airbag is disabled; ON lit means it is enabled.
What to do: If an adult is seated and OFF is lit, sit upright for about two minutes or ride in the rear. PDF page 50

Cruise Control

Cruise control system is switched on. PDF page 95

Summarized in our own words from the 2019 Ford Flex owner's manual (AI-assisted; every light name was matched against its cited page 2026-10-18). Your vehicle may not have every light, and other years can differ. A red warning that stays on usually means stop safely and check: your manual has the final word.