This is an Ignition Coil and engine misfire problem. On some Mazda3, Mazda6 and CX‑series models, ignition coils can fail and cause cylinder misfires, rough running, check‑engine lights, and reduced engine power.
What needs to be repaired or replaced
Our Mazda technicians use scan tools* to pinpoint which cylinders are misfiring, then inspect spark plugs, coils, and related wiring. Replacing faulty coils and spark plugs, and addressing any valve cover leaks or oil intrusion into the sparkplug tubes, typically restores smooth engine operation and performance.
*What is a scan tool? An electronic test tool that connects to the vehicle's on-board computer to check for error codes or problems stored in the vehicle computer memory.