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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.

Front secondary HO2S (Bank 2, Sensor 2) SO2HTB2 line short to ground
Front secondary HO2S (Bank 2, Sensor 2) SO2HTB2 line open
Front secondary HO2S (Bank 2, Sensor 2) heater power supply line failure
PCM internal circuit failure