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Home › Chevrolet › 2002 › Impala LS › Repair and Diagnosis › Engine Performance › System › Engine Control System Self-Diagnostics - 3.8L › Inspection/Maintenance Procedures › Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure › Conditions For Running

Conditions For Running

Engine Coolant Temperature (ECT) is more than 165°F (75°C).
Engine is running in closed loop.
Engine has been running for more than 4 minutes.
Battery voltage is 9-18 volts.