99 f250 v10 I have a service engine light that came up as -running too lean, bank 2- guy at parts store sold me an oxygen sensor said it was the downstream sensor. Said it was after the cat. For the life of me I can't find a sensor after the cat. Theres nothing there. I see 2 coming out of the exhaust manifold under the block. (1 on each side) but that's all I see. My truck sits up plenty high so I have a clear view all around and it just isn't there.