FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
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Car repair manuals for everyone.
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Buick
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1987
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Skyhawk L4-121 2.0L Turbo VIN M FI
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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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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.