Diagnosis and maintenance of ignition coils

NGK provides useful tips for troubleshooting for ignition coils: from the visual inspection to the maintenance and diagnosis to practical tips

If the vehicle no longer starts up, the engine audibly misfires or the vehicle's acceleration is significantly impaired, this may indicate a defective ignition coil. The same applies if the check engine lamp illuminates, the engine control unit switches to emergency mode or an error code is displayed.

Here you can find useful tips, like how to recognise a potential malfunction of the ignition coil, how to limit the error and how to check the function.

In the course of the inspection, please be sure to always observe the instructions of the vehicle manufacturer, because there may be deviations between individual vehicles.