Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1). This sensor is located on the engine bank that houses #1 cylinder and is located BEFORE the catalytic converter
The PCM sends a reference voltage (usually 5-volts) to the variable resistor in the oxygen sensor and looks for a return voltage. At during cranking, it expects to see the full reference voltage return to the PCM since a cold oxygen sensor usually doesn’t alter the incoming reference signal until it heats up. If the PCM doesn’t see the expected return voltage, or sees no return voltage, it will set a P0130 code.
Typical causes are: bad oxygen sensor, poor connection either at PCM or O2 sensor, or a break in either wire.
TEST: Unplug the connector to the Oxygen sensor. Turn ignition to RUN. Test for specified reference voltage at the connector coming from the PCM. If you see reference voltage, reconnect to the sensor and test for voltage on the signal wire returning to the PCM. If you don’t get a return voltage the sensor is most likely bad.
To learn how to replace an oxygen sensor, click here
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© 2012 Rick Muscoplat
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