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Cadillac
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2005
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XLR
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls (DTC P0341 To P0629)
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DTC P0451
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Conditions for Setting the DTC
Conditions for Setting the DTC
The FTP varies more than 0.37 mm Hg (0.2 inches H2O) for 5 seconds at idle.
OR
The FTP varies less than 0.02 volts for 5 seconds while driving.