1990 Buick Century Where is it at?

[quote:0dedb32f69="playapsycho"]1990 Buick Century 6 cyl Automatic
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I was wondering where are my oxygen sensors on my car is because i asked a couple people around and they say that i have two of them and one is on the muffler. So can you let me know howmany i have and where are they located at?[/quote:0dedb32f69]

there in the exhaust manifolds, you should have 2

not the muffler