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2002
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Firebird Formula, Automatic
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Engine Performance
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Engine Control System Self-Diagnostics - 5.7L
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Diagnostic Tests
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DTC P0449: EVAP Vent Valve Performance
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Conditions For Setting DTC
Conditions For Setting DTC
The control module detects that the commanded state of the driver and the actual state of the control circuit do not match.
The conditions are present for a minimum of 5 seconds.