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P1138 Diagnostic Trouble Code Discussion for October 2008

Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit High Voltage During Decel Fuel Cutoff

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Trouble Ticket Help Requests for DTC P1138
Help Request Posted
2005 Nissan Sentra 1.8L MIL Lamp on VIN: 3N1CB51D25
P1138: Swirl Control Valve Control Performance. I am not sure why this code (P1138) is setting. I disconnected the actuator and scoped the sensor while moving the valve assembly - operation is smooth and the sensor waveform is smooth with no dropouts. With a cold engine at idle, the ECU controls the valve (...
October 22, 2008