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Home >> Toyota >> 2012 >> Prius Two >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 44 (Engine Control System (Plug-In) (Diagnostic Codes (P0010-P0454))) >> SFI System >> DTC P0101: Mass Air Flow Circuit Range / Performance Problem >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

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Both of the following conditions are met -
Average engine load value ratio Less than 0.1, or higher than 3.5 (varies with estimated engine load)
Average air fuel ratio Less than -20%, or higher than 20%