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Is the code stating open circuit usually caused by a bad O2? And would it throw me in limp mode

I have a 2020 3.0 with the follow mods: CTS CAI Catless DP O2 sensor spacer Mhd stage 2 91 OTS tune I’m having an issue where I was driving perfectly fine, and all of a sudden my car wouldn’t make over 8 psi WOT. I’ve also had a weird intermittent CEL over the past week or so. If anyone has any...