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2009
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MX-5 Miata L4-2.0L
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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
DTC U0121 Communication error to ABS HUCM or DSC HUCM
Determining Malfunctioning Part (HS-CAN) [Multiplex Communication System]