1 to 4 wire sensor illustration
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3 Wire
A 3 wire oxygen sensor may also be referred to as a HEGO sensor (Heated Exhaust Gas Oxygen Sensor). Their operation is similar to 1 wire sensors, except they have an internal two wire pre-heater which enables the sensor to more rapidly achieve proper operating temperature. One wire carries the sensor signal while the other two wires supply voltage to the internal heater. Like a 1 wire sensor, the signal ground is achieved through the sensor body where it threads into the exhaust system. |
