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1995
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LeSabre Custom
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Repair and Diagnosis
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Engine Performance
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Engine Controls - Tests W/Codes
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ECM/Pcm Code Charts
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DTC P1257: Boost Control Problem - VIN 1
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Diagnostic Aids
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Notes
Diagnostic Aids: Notes
An intermittent may be caused by rubbed through wire insulation. Check for:
Boost control driver circuit shorted to ground.