I drive a Mercury Mariner, it has 26000 mileages. When I drive on the highway, a wrench light and check engine light come on.. The wrench light goes off immediately. The engine light stay on about week. Neither light come on while driving around town..Only come on when I travel out of town. I want know if this a transmission problem..and how serious is it??
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If the Check Engine light is flashing, it is serious. If it is not flashing, then it is most likely an emissions related issue and not very serious. Take it to just about any local auto parts store and they will scan the codes for free. Post the codes below in the comments and We can get you the information you need.