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1995
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Riviera 3.8 1
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes - 3.8L
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ECM/Pcm Code Charts
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Code P1257: Boost Control Problem
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Diagnostic Aids
Diagnostic Aids
An intermittent may be caused by rubbed through wire insulation. Check for:
Boost control driver circuit shorted to ground.