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How to Reset the Check Engine Light in a Mitsubishi Lancer
- 1). Open the hood of your Lancer, and turn the retaining nut on the negative battery cable clamp counterclockwise to loosen it using a socket wrench.
- 2). Slide the cable clamp off of the negative battery terminal.
- 3). Wait 10 minutes and reconnect the cable clamp. This will reset the Lancer's ECU (electronic control unit) and the check engine light.