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The NGK direct-fit oxygen sensor for Infiniti QX4 (2001–2003) provides continuous closed-loop oxygen feedback to the vehicle ECU to help regulate air–fuel ratio, support engine performance and reduce emissions. It employs an advanced ceramic element protected by a 3-stage contaminant-resistant plasma jet and deposit-trap overcoat to minimize element poisoning, with designs refined alongside OEM manufacturers for reliable fit and durability.
NGK Infiniti QX4 2003-2001 Direct Fit Oxygen Sensor
