1 to 4 wire sensor illustration
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1 Wire
A 1-wire oxygen sensor may also be referred to as an EGO Sensor (Exhaust Gas Sensor). The single wire on this sensor delivers the signal while the ground is achieved through the metal sensor body where it screws into the exhaust manifold. This type of sensor was quickly replaced by the 2 wire sensor because the threads where the sensor screws into the exhaust can easily become corroded, resulting in a degraded ground connection, leading to faulty sensor readings. On the 2 wire sensor, one lead delivers the signal while the second lead is the ground. |
