Catless downpipe o2 sensor questions

[mkv_ppf]

Hey! newbie here, I want to install a Catless downpipe, and I don't know much about engine light errors.
Will the o2 error do any harm? Change the fuel ratio?

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[Rocksandblues]

no harm

 

[NitroYellowMKV]

Nope, you will be totally okay, just have to live with the Check engine light till you are flashed.

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