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Chevrolet
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2002
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Impala LS
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Self-Diagnostics - 3.8L
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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
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.