NGK direct-fit oxygen sensor for 2000–2004 Volvo S40. Oxygen sensors deliver continuous closed-loop feedback to the ECU to support optimal engine performance, better fuel efficiency and lower emissions by managing air–fuel ratio and notifying OBDII systems of fuel delivery or catalytic issues. This sensor features an advanced ceramic element protected by a 3-stage contaminant-resistant plasma-jet and deposit-trap overcoat to resist poisoning and improve longevity.
NGK Volvo S40 2004-2000 Direct Fit Oxygen Sensor