Possible Cause

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

• Rear secondary HO2S (bank 1, sensor 2) SO2B1 line open
• Rear secondary HO2S (bank 1, sensor 2) SO2SGB1 line open
• Rear secondary HO2S (bank 1, sensor 2) SO2SGB1 line short to power
• PCM internal circuit failure