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To answer specifically what is wrong with your vehicle will be impossible without more information. The check engine light comes on when the PCM(computer) sees a problem somewhere in the engine or transmission control system. A sensor may have failed, a solenoid or actuator may have failed, a wiring problem may have developed, or there could even be a problem with the PCM itself. You will have to have a diagnostic run on the vehicle.

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2006-03-21 17:47:35
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Q: When 94 Ranger 2.3 check engine light comes on and goes off when on highway What is causing this?
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