Mazda3 Front Oxygen Sensor Z602-18-861 Universal Type, Improves Power

Mazda3 series front oxygen sensor, OEM Z602-18-861, uses high-temperature ceramic core and stainless steel housing; process aligned with OEM standards to withstand exhaust heat and vibration. Monitors air-fuel ratio and feeds ECU to optimize injection; replaced sensor improves idle stability and acceleration lag. Installation difficulty: medium; remove/install near exhaust manifold joint; use dedicated socket and avoid tugging on wiring; capable for DIY enthusiasts.