Mazda6 2.3 Front Oxygen Sensor ZL27-18-861 O2 Sensor

Mazda6 2.3L engine front oxygen sensor ZL27-18-861 (OEM part number ZL27-18-861A); designed specifically for this displacement and matches OEM specs. It monitors exhaust oxygen content in real time and feeds ECU to optimize air-fuel ratio, reducing fuel consumption and emissions. Replacement difficulty is moderate; use a dedicated oxygen sensor socket to avoid thread or wiring damage; ensure efficient engine combustion after installation.