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NGK direct-fit oxygen sensor for 2000–2001 Audi A4. Oxygen sensors provide continuous closed-loop feedback to the engine control unit to help maintain optimal engine performance, improve fuel economy and reduce emissions by controlling the air–fuel ratio and alerting OBDII systems to fuel delivery or catalytic converter problems. This unit uses an advanced ceramic element with a 3-stage contaminant-resistant plasma-jet and deposit-trap overcoat to protect against poisoning.
NGK Audi A4 2001-2000 Direct Fit Oxygen Sensor
