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Home >> Mazda >> 2004 >> 3 s, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0139: Middle Ho2S Circuit Problem >> California Emission Regulation Applicable Model
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California Emission Regulation Applicable Model

Fig 1: DTC P0139: Detection Condition & Possible Causes Chart
G00974497Courtesy of MAZDA MOTORS CORP.