How Often Should the Spark Plugs on a Toyota Corolla Be Replaced?

[DeMalachi]

Toyota Corolla uses Denso iridium platinum spark plugs, model SC20HR11, with a replacement interval of 60,000 to 80,000 kilometers. Spark plug replacement interval: Under normal maintenance conditions, replacement is recommended after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type. It is advisable to follow the owner's manual. You can refer to the following standards for maintenance replacement: Platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Spark plugs are crucial components of a gasoline engine's ignition system. They introduce high voltage electricity into the combustion chamber and create a spark by jumping the electrode gap, thereby igniting the combustible air-fuel mixture in the cylinder. Main types of spark plugs include: standard spark plugs, insulator projection spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface gap spark plugs.