Originally Posted by Mbafordranger
Are you sure so where is the right one located exactly remember I don't know about trucks engineor do u have a picture of location
If he was at the passenger wheel well, that sure sounds like he replaced sensor #1.
Bank 1 = Passenger Side
Sensor 1 = Up near the exhaust manifold (aka - upstream of the cat)
Sensor 2 = Just past the cat (aka - downstream of the cat)