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NGK direct-fit oxygen sensor for 2000–2006 Audi A4. Oxygen sensors deliver continuous closed-loop feedback to the engine control unit to help preserve engine performance, increase fuel efficiency and lower emissions by regulating air–fuel ratio and alerting OBDII systems to fuel delivery or catalytic converter concerns. This unit employs an advanced ceramic element with a 3-stage contaminant-resistant plasma-jet and deposit-trap overcoat to improve resistance to element poisoning.
NGK Audi A4 2006-2000 Direct Fit Oxygen Sensor
