91 accord ex O2 sensor location help???

[shaibi]

I need to replace my oxygen sensor in my 91 accord EX, the problem is that I cant find it. It is not in the exhaust manifold where my manual says it should be (I removed the heat shield and checked). Thanks in advance for any help!

[mpumas]

It is just before the cat converter to the rear of the engine. It is the only thing that has wires attached to the exhaust pipe.