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DTC 522735 Oxygen Sensor Short/Open
Conditions for Setting the DTC
Heated Oxygen Sensor
Check Condition-Ignition ON
Fault Condition-Less than 30mv
MIL-On
Circuit Description
The EGO sensor (Exhaust Gas Oxygen) sensor is used to determine if the fuel flow to the engine is
correct by measuring the oxygen content in the exhaust gas. The EGO sensor uses an internal heating
element to keep the sensor active. This fault will set if the ECM detects a short low or open in the HEGO
heater element or control circuit. NOTE: The HEGO sensor is sensitive to silicone and silicone-based
products and can become contaminated. Avoid using silicone sealers or hoses treated with silicone lubri-
cant in the air stream or fuel supply lines.
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