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Check Engine Light Came On

3.5K views 13 replies 5 participants last post by  Neevosh  
If your fuel mileage dropped that much my first guess would be a partially clogged or compromised fuel injector. The misfire code (if that's what comes up) would not tell you whether it's electrical or fuel related, and it may not even specify the cylinder-- just a straight P0300 code which would just be random cylinder misfire. Please keep us posted!