Diagnosis and installation

With easy accessibility, the replacement of sparkplugs is one of the simpler do-it-yourself tasks for vehicle owners, however there are some things which must be taken into consideration for this task.
When removing and installing spark plugs it is important to have the right tool on hand

With easy accessibility, the replacement of sparkplugs is one of the simpler do-it-yourself tasks for vehicle owners, however there are some things which must be taken into consideration for this task.

Particularly with modern vehicles it is important that you have the right tool. Otherwise there is a considerable risk of damaging the spark plugs when unscrewing them or screwing them in.

Only replace spark plugs once the engine has cooled down

With today's engines, which are normally equipped with aluminium cylinder heads, the aluminium expands more than the spark plug when heated up, with the consequence that the spark plug can be fastened in place. Therefore, spark plug replacement should only take place with the engine completely cooled down, as a basic rule.

Question of type

Make sure that the new spark plugs are the same spark plug type as the spark plugs being replaced. If you are not certain which spark plug type you need for your vehicle, take a look in our product finder or ask an expert from NGK or your local workshop.

Related topics

Torques: For the professional installation of a spark pug, a torque wrench and the correct torque values are an absolute necessity.

Brief installation instructions: The steps listed here help you with the replacement of spark plugs.

Defects: Defects provide important information about malfunctions.

Product finder: The NGK product finder helps you find the right spark plug.

Products and technology

Requirements Spark plug technologies