Oxygen Sensor (Denso) - EVO4-9

Denso Oxygen Sensor – EVO4-9 – 53 cm wire (69 cm overall). For EVO9, serves as the front O₂ sensor. O₂ extender cable required for Invidia or other aftermarket dump pipes (may also be needed for stock – check length). Ensures accurate air-fuel readings for optimal engine performance and emissions control.

An O₂ sensor is important because it measures the oxygen content in exhaust gases, allowing the ECU to adjust the air-fuel ratio for optimal performance, fuel efficiency, and emissions control. A faulty sensor can cause poor fuel economy, loss of power, and increased emissions.