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Here's where the O2 sensors are on my 2k2 HX coupe. One in the exhaust manifold, and one at the rear of the cat. How do these compare to the EX, LX, DX?

 
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I think that it is the same on the LX/DX, but the EX is different. There's a header/downpipe/cat/exhaust combo you can buy that will fit on any trim line, I saw it somewhere on this site before. I think that would be the best one for the HX because of our wierd exhasut system. (I have an HX too)

 
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The sensor on the EX is located close to the first on on yours. I just installed my air/fuel ratio meter yesterday...in my finally finished custom gauge pod....Hope to post pictures soon!!