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Home › Pontiac › 2001 › Aztek Base, AWD › Repair and Diagnosis › Engine Performance › System › Engine Controls Self-Diagnostics › Inspection/Maintenance Procedures › Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure › Enable Criteria

Enable Criteria

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