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Hi Steve replaced both upstream 02 sensors as the codes are for the heater circuit on both bank 1 sensor 1 bank 2 sensor 1 and no change also evap purge valve no response now my truck has 2, 1 under hood and 1 ontop of spare tire no power to either and pulled harness to make sure no bad wires...

Bought my 06 explorer from a mom and pop dealer they swapped the 06 4.0 for a 12 4.0 and computer not reading evap system or any o2 sensors truck getts 7 miles to gallon what do I need to do to make it right im a mech of 28 years but not familiar with engine upgrades or new engine to older...