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I have a 2000 civic lx and have my cel on for a o2 sensor I bought a pair on eBay motors and I can’t tell the difference in the upstream and downstream if anyone could help that would be great right now I’m just replacing the upstream and if the cel goes off then I’ll replace the other one if it stays on I’ll do the opposite please and thank you Both new sensors have a W on them and have no difference they look the exact same
🙏 “https://ebayvehicle.com/app/zeYS”
Need help with o2 sensors
