fowl19

I own a 92 SC300 and my check engine light is on. I am getting code 27 and as far as I could tell, that means Sub O2 sensor malfunction. My problem is ppl have told me there are 3 o2 sensors and others have told me that I only have 2 on the headers. I just want to find the right sensor and replace it. If you have any info email me at jareed_001@yahoo.com or just respond to this. Thanks