Operation CHARM
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Pontiac
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1986
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J2000/Sunbird L4-112 1.8L
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Repair and Diagnosis
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Powertrain Management
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Scan Tool Testing and Procedures
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Port Fuel Injection Models
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Function Selector Positions
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Exhaust
Exhaust
Indicates whether O2 sensor rich or lean operating condition. Normal displays are ``RH'' for rich indication and ``LN'' for lean indication.