How to fix codes C0200 and B1811?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your Corolla. Since it sounds like these codes appeared after replacing the transmission, CV axles, and front brake pads, let's go over some things that could have happened during the repairs that may have caused those codes to set. The C0200, referring to the right front wheel speed sensor, could be caused by a few things. The wheel speed sensor itself or the wire could have been damaged during the repairs, there could be debris on the sensor, or a problem with the tone ring on your new cv shaft. As for the B1811, referring to the steering wheel airbag circuit, consider that the clock spring on the steering column could have been damaged during the repairs. If the power steering rack was removed along with the subframe when replacing the transmission, it's very possible that the steering wheel got turned while disconnected and broke the clock spring. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!