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I replaced my sub O2 sensor (post cat) with a Denso 234-4623 (OEM 89465-33030) and I am now planning on replacing the front two, before the cat. I took off the bank 2 sensor 1, which is a 1 wire with a OEM of 89465-33020...My question is are both the pre cat O2 sensors the same, they are a flange type, (I have CALI car by the way) This OEM number I can't find any where, I think I need OEM 89465-39405, but not sure...the denso number is 234-1053.......anybody out there to shed some light, thanks!!!!!
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