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...located? A pic would be great! I see the O2 sensor up front by the radiator, actually there looks like 2 of them. I initially thought the on up front, at the bottom, was the one to replace. But was told that it is located in the middle of the exhaust pipe by the catalytic converter. I looke underneath along the pipe but did not see anything that looked like the o2 sensor part. A picture wou;ld be great. My emisions test is failing and this seems a pretty easy part to replace, if I can find the darn thing! Thanks Dennis