What is the original spark plug model for the Corolla Hybrid?
3 Answers
Corolla Hybrid's original spark plug model is Denso SC20HR11. What does a spark plug consist of: A spark plug mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. What are the types of spark plugs: Main types of spark plugs include: standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface gap spark plugs. How does a spark plug work: Under high voltage, the air between the spark plug's center electrode and side electrode rapidly ionizes, forming positively charged ions and negatively charged free electrons. When the voltage between the electrodes reaches a certain value, the number of ions and electrons in the gas increases like an avalanche, causing the air to lose its insulating properties and forming a discharge channel, resulting in a "breakdown" phenomenon. At this point, the gas forms a luminous body, known as a "spark." Along with its thermal expansion, a "crackling" sound is also produced. The temperature of this electric spark can reach as high as 2000-3000°C, sufficient to ignite the air-fuel mixture in the cylinder combustion chamber.
Research on the Corolla Hybrid's spark plugs uncovered an interesting fact: the heat range setting of the OEM FK20HBR8 is meticulously designed. Due to the hybrid engine's frequent start-stop cycles, the spark plugs endure greater thermal stress. This model features a center electrode diameter of just 0.4mm, enabling more precise ignition while reducing misfire rates. It's recommended to inspect the electrode gap every 60,000 km - replacement is necessary if it exceeds 0.8mm. Last time when helping a friend source parts, I noticed aftermarket units online with mismatched heat range specifications that triggered engine warning lights. The genuine part packaging bears Toyota part number 90919-01258 - cross-check this when purchasing for reliability.
The original spark plug for the Corolla Hybrid is the Denso FK20HBR8 iridium-platinum type. This model is not interchangeable with the regular Corolla, mainly due to the difference in heat range. If you're replacing it yourself, you'll need a 16mm spark plug socket and a torque wrench, with a tightening torque of 20N·m—be careful not to over-tighten. Remember to disconnect the ignition coil connector before removal to avoid triggering fault codes. I've noticed many owners wait until 100,000 km to replace them, but the manufacturer actually recommends replacement at 80,000 km for optimal performance.
