u/Impressive-Pound6988

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▲ 1 r/e46

These readings were taking at 2500 rpms. My codes are P0420&430. I’m trying to tell if my cats are done for. But I feel like my upstream 02 sensors are reading what my downstream sensors should be. Is it true that both sensors S2 are for downstream reading my cats? If so are my readings backwards? I’m confused

u/Impressive-Pound6988 — 9 days ago
▲ 1 r/e46

P0420 & P0430 codes on 05 bmw 330i. Recently had misfire codes as well but I replaced the upstream 02 sensors and the misfires is gone for now(as of a week later) Still have these two codes that came back after I erased the codes about a week ago after replacing the upstream sensors. How do I fix the p0420&430 codes?

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u/Impressive-Pound6988 — 10 days ago