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Mazda Truck
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2010
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CX-7 AWD L4-2.3L Turbo
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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U Code Charts
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U0121
U0121
U0121 - Communication error to DSC HUCM
Determining Malfunctioning Part (HS-CAN) - Multiplex Communication System