Fiesta Oxygen Sensor 3N21-9F472-AA 0258005338 Precise Replacement

When Ford Galaxy shows idling instability, weak acceleration, higher fuel consumption or engine fault light, oxygen sensor aging is likely. The sensor feeds ECU with air-fuel ratio to maintain optimal combustion, ensuring power and economy. Replacement fits Ford Fiesta models; OEM 3N21-9F472-AA (0258005338). Installation: ensure thread cleanliness, tighten with dedicated tool to recommended torque to avoid thread damage or leakage.