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    4. Toyota Corolla 2005 Engine Hesitation
    Toyota Corolla 2005 Engine Hesitation

    I occassionally have engine hestitation, especially when i slow down at a traffic and about to pedal down to move again the engine rpm drops & i have to off the engine and restart several times before the engine picks up on good rpm to move again. Tried cleaning the Airflow sensor but no success. The system diagnosis reads the following; 1. PO420; Catalyst System Efficiency Below Threshold (Blank 1) 2. P0657; Actuator Supply Voltage Circuit/Open 3. P2116; Throttle Actuator control motor Current Range/Performance

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    0  Views: 1035 Answers: 1 Posted: 12 years ago
    Tags: engine light
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      1 Answer

      sounds like your O2 sensor  is bad and it is messing up your Catalyst System which is over heating and cutting down on your RMP's 

      12 years ago. Rating: 2
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