Can bad spark plugs cause the check engine light?

Yes, worn or fouled spark plugs are a common cause of the check engine light because they lead to engine misfires that the computer detects. When a spark plug cannot ignite the fuel mixture reliably, the affected cylinder misfires and the computer stores a code like P0300 or P0301 through P0308. Symptoms include rough idling, hesitation, hard starting, reduced power, and worse fuel economy. A flashing check engine light caused by a misfire means you should stop driving to avoid catalytic converter damage. Replacing spark plugs at the recommended interval prevents many of these issues, but other ignition or fuel components can cause similar codes. At Motoro Cars in Miami, our ASE-certified, AAA-approved technicians use computerized diagnostics to confirm whether plugs, coils, or another part are at fault. Call Wynwood at (786) 634-2002 or Doral at (786) 633-3220 to get an accurate diagnosis.