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Home › Buick › 2003 › Century Base › Repair and Diagnosis › Engine Performance › System › Engine Controls Self-Diagnostics - 3.1L Engine › Drive Cycles › Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure › Conditions For Running Test

Conditions For Running Test

The ECT sensor parameter is more than 176°F (80°C).
Engine is in closed loop fuel control.
Engine has been running more than 4 minutes.
Battery voltage is 10-18 volts.