Oxygen Sensor Wiring RepairsExhaust Gas SensorsBecause most oxygen sensors operate on less than one volt, special harness repair procedures mustbe followed. The slightest poor connection will have a voltage drop across it. This voltage drop takes away voltage from the original signal being monitored by the enginecomputer. This can cause inaccurate readings and incorrect amounts fuel delivered to the cylinders. This can result in poor fuel economy, poor performance, or both.Repairs of oxygen sensor wiring are allowed as long as the repair is in the main vehicle harness. Thepigtail wires attached to the sensor are not allowed to be repaired.Always solder any wiring repairs.There are two types of exhaust gas sensors:Oxygen Content Sensor- A four-wire Heated Exhaust Gas Oxygen Sensor (HEGO) measures theoxygen content of the exhaust gas. This sensor's output signal is used to indicate a lean or richcondition when compared to stoichiometric (14.7: air-fuel ratio) . An oxygen sensor is a uniquesensor because it actually produces its own variable voltage signal.
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