Hey guys, recently bought a 2018 Kawasaki Z125 with a couple goodies, including a TB 143 cc big bore kit, race head, race cam, Z-AFM 4.9 self fuel mapping module, MNNTHBX silicone intake and more. I'm relatively new to the bike life and barely beginning to learn and understand them. The guy who sold me the bike also gifted me a full yoshimura exhaust kit. However there is a hole where the o2 sensor should've been. I believe because of this the bike is throwing a check engine. If anyone knows of any such device or tune that would eliminate the code please inform me. Also if anyone can give me any sort of direction as to what to look out for check that would be much appreciated.