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Cadillac
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2003
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Seville STS
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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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Drive Cycles
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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 11.7-16.0 volts.