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If ECU detects problems with primary catalisator (by using said O2 sensor), it will throw appropriate CEL (don't remember which code), and will disable cruise control. Except that no other ill effects.
One can disable those checks in ECU tune. Most popular for this platform ECU tuning solutions are Ecutek/OFT/Tactrix. Ecutek might be better option if tuned with professional tuning shop, OFT & Tactrix might be better choice for ones to DIY tinker.
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