Code 15: (Oxygen Sensor)

Fig 1: Trouble Code No. 15 (Diagnostic Flowchart)

Courtesy of MAZDA MOTORS CORP.

Fig 2: Trouble Code No. 15 (Schematic - CA B6 & MTX)

Courtesy of MAZDA MOTORS CORP.

Fig 3: Trouble Code No. 15 (Schematic - ATX Except CA)

Courtesy of MAZDA MOTORS CORP.