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1999
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Firefly (CANADA) L4-1.3L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Scan Tool Data Definitions - Powertrain Systems
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HO2S 2 Ready
HO2S 2 Ready
A yes display indicates that the
oxygen sensor
is warmed up and is capable of sending useful voltage readings to the
PCM
. No display indicates a cold (not ready) oxygen sensor.