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Home › Buick › 2002 › Century Custom › Repair and Diagnosis › Engine Performance › System › Engine Control System Self-Diagnostics - 3.1L Engine › Inspection/Maintenance Procedures › Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor (Ho2S/O2S) System Set Procedure › Conditions For Running Test

Conditions For Running Test

Engine coolant temperature is more than 176°F (80°C).
Engine operating in closed-loop.
The engine has been running for more than 4 minutes.
Battery voltage is 10-18 volts.