2001s 40 turbo code po133 last ownet gave up

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Gave up o replacing sensors .light comes on after 20 mi Went to dealer they said no recall is opened.It did not have a extra harness but I thought it could have been taken out , last owner does not remember. Dealer did not mention a reset or software upgrade . Where do I go to find out if this car needs updated software or to be reset after a new sensor is put in ? What will disconnecting the battery for 8 hrs do?Exhausted in Oceanside ca