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Mazda
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2007
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Mazdaspeed6 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
Output module:
PCM
AWD Control module
Procedures For Determining the Location of A Malfunction