O'Fallon Auto Repair

We hear this question often at Hillside Auto Repair here in O’Fallon, Missouri. You are driving down Highway K or sitting at the light on Bryan Road, and suddenly that amber glow of the check engine light appears on your dash. Your heart sinks a little. Naturally, you swing by AutoZone to grab the free code scan. They hand you a printout that says P0304, which translates to a cylinder 4 misfire. You think, "Great, the problem is right there. Why would I pay Hillside Auto Repair a diagnostic fee just to look at the same thing?" We completely understand the frustration. But we want to pull back the curtain on what is really happening under that hood and why our diagnostic process saves you money in the long run. Code Reading Is Just the Start Here is the hard truth that the free printout does not tell you. The code P0304 is not a diagnosis. It is a symptom. It is the equivalent of a patient walking into a doctor’s office and saying, "My elbow ... read more