What can cause an check engine soon light on steady. ..on a 2004 Mercury Mountaineer
well with this information only thing we can rule out is a misfire. Then it would flash. A engine light can come on for way too many reasons to even guess, could be a loose gas cap to a bad thermostat. Have somebody scan the Merc and then post the code and we will be able to help you. The auto parts stores usualy do this for free
Over 100 different things! Visit your local auto parts store and ask them to scan the computer. Most stores will do it for free. Post the trouble codes here and we can help further. HTH. -Jim
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