Can bad ignition coils trigger the check engine light?

Yes, failing ignition coils commonly trigger the check engine light because they cause engine misfires that the computer detects and stores as codes. Ignition coils provide the high voltage that spark plugs need to fire, and when a coil weakens or fails, its cylinder misfires. You may notice rough idling, hesitation, loss of power, poor fuel economy, and possibly a flashing check engine light, which means you should stop driving to protect the catalytic converter. Misfire codes like P0301 through P0308 point to the specific cylinder, helping identify which coil may be bad. Because spark plugs and injectors can cause similar symptoms, proper testing matters. At Motoro Cars in Miami, our ASE-certified, AAA-approved technicians use computerized diagnostics to confirm a faulty coil before replacing it. Call Wynwood at (786) 634-2002 or Doral at (786) 633-3220 to get a precise diagnosis and stop the misfire.