how many oxegen sensers on a 2007 camry with a v6 on 2007 Toyota Camry

mechanic replaced oxgen senser a week ago. check engine light came back on . now they say another one needs to be replaced and if that don't work the manifold needs replacing

Asked by for the 2007 Toyota Camry
There's 4 of them, and I would take it someplace who can test it and not speculate on 'maybe'. Try Kansas City mechanics, there is a lot of trouble with mechanics in Potwin.
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My Camry did the same thing and so did my friends Camry but after both sensors changed no more lights.