I'm running headers/high flow cats, and it looks to me like one of my sensors is bad. (recurring DIC). Cars got only 32k miles.

Q. Should I replace both sensors or go with O2 sims? I live in Nevada and I don't know if it will still pass emissions with sims.

All your help/suggestions would be greatly appreciated!!
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you can't put in a SIMM for either sensor 1. those are used for STFT/LTFT's....you only use SIMM's for sensor 2 (after cat).