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The NGK direct-fit oxygen sensor for Audi A4 (2009–2010) restores precise air-fuel ratio sensing and closed-loop feedback to the ECU to help maintain engine performance, improve fuel economy and reduce emissions. Built by NTK, a ceramics-focused OEM supplier, the sensor features an advanced ceramic element protected by a 3-stage contaminant-resistant plasma-jet and deposit-trap overcoat to resist element poisoning.
NGK Audi A4 2010-2009 Direct Fit Oxygen Sensor
