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Pontiac
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2002
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Aztek FWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls Self-Diagnostics
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Inspection/Maintenance Procedures
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Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure
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Conditions for Running
Conditions for Running
The Engine Coolant Temperature (ECT) is more than 176°F (80°C).
The engine is running in Closed Loop fuel control.
The engine has been running for more than 4 minutes.
The battery voltage is between 10-18 volts.