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Pontiac
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2007
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Vibe Automatic
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Repair and Diagnosis
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Engine Performance
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Engine Control System & Fuel System - DTC P0010 To DTC P0128
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DTC P0121
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Conditions for Running the DTC
Conditions for Running the DTC
The ignition is ON or the engine is running.
DTC P0121 runs continuously once the above condition has been met.