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Replace a Spare part Ignition coil – a defective one or if the limit of use has been already reached. Find out useful information about Ignition coil

Faulty ignition coil

  • mechanical damage of the ignition coil;
  • wear and tear of the part;
  • overheating of the ignition coil;
  • wear of the ignition coil terminal;
  • rupture of the coil winding.

Symptoms of the ignition coil failure

  • dips in the engine cycle;
  • decrease in maximum power of the vehicle;
  • the engine failures occur more frequently with a high humidity level in the atmosphere;
  • increase in fuel consumption;
  • indicator reading «Check Engine» on the dashboard.

Causes of a faulty ignition coil

  • use of low-quality spark plugs;
  • engine overheating;
  • exposure to high temperatures, dust and dirt;
  • damage to the coil insulation at a voltage higher than 35 000 V;
  • vibration of coils and looseness of fastenings;
  • overload of electrical circuit.


Identifying the faulty ignition coil without special equipment is impossible. Independently you can estimate the appearance of the coil: if the housing has traces of oxidation, small holes or black spots, the coil is out of order.

If there is a slightest sign of failure, check the item at a service station. Use an ohmmeter or multimeter to measure the resistance of the primary and secondary coil windings. The primary winding resistance should be in the range of 0.5-2 ohm. Value of secondary winding resistance should be in the range of 6000-15 000 ohms. To accurately determine the fault it is necessary to find out the exact values ​​of the norms in the vehicle technical documentation.

The service life of the ignition coil is 60 000-80 000 kilometers. Diagnostics of the system is recommended after 30,000 kilometers or every six months.

Repair and replacement of ignition coils

The ignition coil cannot be repaired. Ingress of oxygen into the body always impairs the system, so even small deviations in the part’s performance require only to replace it.

One of the main factors of the part normal operation is correct wiring. Replacing the coil does not take much time, but if you do not have the necessary knowledge, you should refer to a service shop.

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FAQ: Frequently asked questions
How do I know if an ignition coil is faulty?
How can I test the ignition coil myself?
How is the new ignition coil installed?
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