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Home >> Buick >> 2000 >> LeSabre V6-3.8L VIN K >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> Rich/Lean
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Rich/Lean

Scan Tool Displays RICH or LEAN. This indicates whether the oxygen sensor voltage is greater than a 600-mV threshold voltage (rich) or less than a 300-mV threshold voltage (lean). The voltage should change constantly while in closed loop, indicating that the PCM is controlling the air/fuel mixture properly.
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