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Check Engine Indicator Light Concerns

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

  1. Perform KOEO On-Demand Self-Test

    If CHECK ENGINE light is always on, check for Diagnostic Trouble Codes (DTC). Perform KOEO ON-DEMAND SELF-TEST under QUICK TEST in SELF-DIAGNOSTICS - 7.3L DIESEL article. If no DTCs are present, go to next step. If any DTCs are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 7.3L DIESEL article and perform appropriate SYSTEM TESTS.

  2. Run Bulb Check

    Cycle ignition switch. If CHECK ENGINE light illuminates then goes out (bulb check), no problem is indicated. If CHECK ENGINE light is always off or always illuminated, go to TEST NB: CHECK ENGINE LIGHT , step 3)  (Econoline), or step 1)  (Excursion and F250-550) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article.
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