+18 Ford F250 Check Engine Light Reset References. Web a loose gas cap is a common reason the engine light is on. If the engine light has come on, it is because the system has found a fault that needs attention.

There is only one port large enough to accommodate the obd tool plug. Turn the ignition key to the ii position and wait for the check engine light to go off. This action erases the stored trouble codes in the vehicle's onboard computer, which.





