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That is your air filter indicator light. Time to change your filter.
Or, if you have already done that lately, dont forget to reset the "Filter Minder" its the little cylinder with a spring in it. It has a gauge along the side. Press the big yellow button to reset the unit and all should be well.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.