Mike's Workshop Manuals
: Service manuals for every vehicle
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Buick
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2001
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Century Custom
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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 - 3.1L & 3.4L
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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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Enable Criteria
Enable Criteria
Engine Coolant Temperature (ECT) is more than 176°F (80°C).
Engine is running in closed loop.
Engine has been running for more than 4 minutes.
Battery voltage is 10-18 volts.