Oxygen sensors, often called O2 sensors, are critical components in modern vehicles. They monitor the exhaust gases to ensure the engine is burning fuel efficiently and cleanly. Among the various types of O2 sensors, the 4-wire sensor is a common design. Understanding the “4 wire o2 sensor wiring diagram” is essential for anyone working on automotive repair, from professional mechanics to DIY enthusiasts. The wiring dictates how the sensor receives power, transmits signals to the engine control unit (ECU), and ultimately affects engine performance and emissions.
