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Mazda TSB #01-021-13-2817B

2010 Mazda MAZDA3

Summary: SOME VEHICLES MAY EXPERIENCE THE MIL ON WITH DTC P0128:00 (THERMOSTAT STUCK OPEN). THIS CONCERN IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM. TO CORRECT THE PROBLEM, THE CONTROL LOGIC OF THE PCM HAS BEEN CHANGED.

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