A common issue with Mazda 3 vehicles is ignition coil failure, which often results in engine misfiring. This affects drivability and increases fuel consumption.
Symptoms
- Engine shakes or runs rough
- Hesitation when accelerating
- Increased fuel usage
- Check engine light illuminated
Possible Causes
- Overheated ignition coils
- Worn spark plugs causing extra stress on coils
- Short circuits in the wiring harness
- Moisture or water intrusion
Solutions
- Replace faulty ignition coils
- Inspect and replace spark plugs
- Check the electrical wiring
- Protect ignition coils from moisture
Preventive Maintenance
- Inspect spark plugs every 20–30k km
- Test ignition coils during regular service
Advice
Prolonged misfiring can damage the catalytic converter, leading to expensive repairs.
