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NGK direct-fit oxygen sensor for 2006–2009 BMW 323i. Oxygen sensors deliver continuous closed-loop feedback to the engine control unit to help keep engine performance optimal, improve fuel efficiency and reduce emissions by managing air–fuel ratio and alerting OBDII systems to fuel delivery or catalytic converter issues. This sensor includes an advanced ceramic element with a 3-stage contaminant-resistant plasma-jet and deposit-trap overcoat to resist element poisoning.
NGK BMW 323i 2009-2006 Direct Fit Oxygen Sensor
