CR-V Odyssey Accord Iridium Spark Plug 9807B-5517W IZFR5K11 ZF Original Replacement

This replacement uses iridium electrode material; higher melting point and wear resistance than nickel alloy plugs, offering an upgrade life of 80,000-100,000 km and more stable firing efficiency. OEM numbers 9807B-5517W, IZFR5K11 and 3657; fits Honda CR-V, Odyssey, Accord and other post-2000 models. Function: ignite the air-fuel mixture; iridium fine electrode reduces required ignition voltage and improves combustion. Installation: medium; use standard 16mm spark plug socket; torque 25-30 Nm; avoid over-tightening to protect threads.