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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System & Fuel System - 5.3L - DTC P0016 To DTC P0358) >> DTC P0068 or P0121 >> Conditions for Setting the DTC >> P0121

Conditions for Setting the DTC: P0121

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The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.