Diesel Data
: Automotive Repair
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Mazda
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2012
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3 L4-2.0L (MZR)
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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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P Code Charts
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P0421
P0421
DTC P0421:00 [MZR 2.0, MZR 2.5]
Diagnostic procedure
