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GMC
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1989
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Forward Control 3.9 L, Automatic, 400/M40
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Repair and Diagnosis
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CCC TBI Tests W/Codes
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Diagnostic Charts
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Code 44 - Lean Exhaust Indication
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Sensor Harness
Sensor Harness
Sensor pigtail may be mispositioned and contacting exhaust manifold.
Fig 1: Code 44, Lean Exhaust Indication Flow Chart & Schematic
Fig 2: Code 44, Lean Exhaust Indication