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If you drive a 2014 GMC Terrain, you may have encountered issues like a misfiring engine or a faulty oxygen (O2) sensor that needs replacing, leading to your check engine light staying on. Fortunately, it's easy to turn the light off, taking just 1 to 5 minutes of your time. Replacing the O2 sensor can cost between $58 and $143 for parts. After fixing the problem, you'll need to reset the warning light by driving your vehicle for about 5 minutes. The longer you drive, the better, but you'll soon see the light reset from simply driving around.
To turn off the check engine light on a 2014 GMC Terrain, you'll have to employ an OBD II scan tool to erase the code.