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The NGK direct-fit oxygen sensor for Audi A4 (2005–2009) supplies continuous closed-loop feedback to the ECU to help maintain optimal engine performance, fuel efficiency and emissions control. Made by NTK, the sensor features an advanced ceramic element with a 3-stage contaminant-resistant plasma jet and deposit-trap overcoat to reduce element poisoning and improve service life.
NGK Audi A4 2009-2005 Direct Fit Oxygen Sensor
