2004 Ford F250 Diesel Supplement 2nd Printing - Page 8

Instrumentation Engine air filter The engine air filter warning light illuminates when the air filter restriction gauge reaches the CHANGE FILTER mark. The condition should be verified by inspecting the underhood air filter restriction gauge; the warning light is only a secondary indicator. Always use the underhood air filter restriction gauge to determine when the air filter element needs to be changed. The vehicle may be driven with the engine air filter warning light illuminated/or when the underhood air filter restriction gauge has moved to the CHANGE FILTER mark for up to 400 km (250 miles) without damaging the engine or related components. However, the air filter element must be replaced at the earliest opportunity. Refer to Air filter restriction gauge (if equipped) in this section of the supplement for more information. Transmission Tow/Haul Feature (5-speed automatic transmission) (if equipped): Illuminates when the Tow/Haul feature has been selected. Refer to the Driving chapter for transmission function and operation. If the light flashes steadily or does not illuminate, have the transmission serviced soon, or damage may occur. 8