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Home › Mazda › 2004 › 3 i, Automatic › Repair and Diagnosis › Engine Performance › System › On-Board Diagnostic [Engine Control System] › DTC P0138: Middle Rear Ho2S Circuit High Input › Diagnostic Procedure

Diagnostic Procedure

Fig 1: DTC P0138: Diagnostic Procedure Chart (Steps 1-3)
G00974495Courtesy of MAZDA MOTORS CORP.
Fig 2: DTC P0138: Diagnostic Procedure Chart (Steps 4-8)
G00974496Courtesy of MAZDA MOTORS CORP.
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