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Home >> Mazda >> 2004 >> 3 s, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0139: Middle Ho2S Circuit Problem >> Except for California Emission Regulation Applicable Model
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Except for California Emission Regulation Applicable Model

Fig 1: DTC P0139: Detection Condition & Possible Causes Chart
G00974500Courtesy of MAZDA MOTORS CORP.
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