Toyota Corolla Yaris Auris Spark Plug 90919-01273 C16HR-U11 Long-Life Stable Ignition

Spark plugs for Toyota Corolla, Yaris and some Cavalier models (2000-2010) engine cylinder head (OEM: 90919-01273 / C16HR-U11), responsible for igniting the air-fuel mixture to ensure smooth engine operation and complete fuel combustion. Installation difficulty moderate; hours about 0.5–1; tighten with torque wrench to standard torque. If idle jitter, weak acceleration, increased fuel consumption, or starting difficulty occur, indicates worn electrodes or heavy carbon buildup; replacement recommended to maintain ignition stability.