Operation CHARM
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GMC Truck
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2001
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S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel
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Repair and Diagnosis
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Sensors and Switches
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Sensors and Switches - Powertrain Management
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Sensors and Switches - Computers and Control Systems
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Oxygen Sensor
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Description and Operation
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HO2S Heater
HO2S Heater
HO2S Heater:
The oxygen sensor heater is required by catalyst monitor sensors to maintain a sufficiently high temperature which allows accurate exhaust oxygen content readings further from the engine.