K16TT 4603 Spark Plug, universal quality compatible with Toyota Prius, Audi, Mercedes and other models

K16TT 4603 iridium spark plugs fit Toyota Prius (post-2000), Audi, Mercedes, Mitsubishi, Subaru, Honda and other models, especially those with M14x1.25 thread. Core function is precise ignition to improve combustion efficiency, reduce fuel consumption, and minimize carbon buildup. OEM has no standard number, but cross-check using part number K16TT 4603 and resistance of 6kΩ. Replacement difficulty medium; use standard cross wrench and apply factory torque to avoid thread damage. Iridium electrode material provides longer life, suitable for high-mileage vehicles.