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: A 3rd party mirror of CHARM + LEMON car manuals
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DTC U2021: Engine Control System
DTC U2021: Engine Control System
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Diagnostic Procedure
Fig 1: DTC U2021 Detection Condition & Possible Cause
Courtesy of MAZDA MOTORS CORP.
Fig 2: DTC U2021 Inspection & Action
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.