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The NGK direct-fit oxygen sensor for Audi A4 (1997–1999) supplies the ECU with continuous closed-loop feedback to help control air–fuel ratio, maintain engine performance and reduce emissions while supporting fuel economy. NTK's ceramic sensor element uses a 3-stage contaminant-resistant plasma jet and deposit-trap overcoat to protect the sensing element from poisoning. NTK also refines sensor designs with OEM partners to improve reliability.
NGK Audi A4 1999-1997 Direct Fit Oxygen Sensor
