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so i have a 1 hour commute from school to home. The past 3 weekends ive been running back home to prepare stuff for grad school. Heres the dillema i keep getting the CEL but only on my way back to school (The car has never done it on the way home) When i turn the car off, the CEL does not come back on, even when driving around school. It has only come on when im on my way back from home to school. I park the car for the night, get back in it the next day and its off. I have scanned the car after each time it comes on, im getting code 12 (diagnostics functioning properly or w.e.) Any idea as to what can be causing this? Its got me stumped, the car will run totally fine with the light and the MPG is consisten. If anyone has a clue please let me know