Mazda3 Xingcheng 1.6L Front Oxygen Sensor Z678-18-8G1 Original vehicle data calibration

Front oxygen sensor uses zirconia ceramic element and laser welding like OEM; signal response within ±2%; durability over 80,000 km; more stable than some aftermarket parts. OEM number Z678-18-8G1; fits Mazda 3 Axela 1.6L (2011-2014). Replaces faulty part; monitors exhaust oxygen and feeds ECU to adjust air-fuel ratio; resolves rough idle, high fuel consumption, and MIL. Installation medium; use 22mm wrench; avoid wire tension; cold-start recommended for DIY.