Question

2003 Lexus SC430 with codes C1223, C1201 and C0205, how do I fix it? How do I fix this issue? I can't find anything that says exactly what to do

Answer 1

All codes are related to the ABS. Here are the links for each code with information. Start by fixing the code C0205 which is for the Left Front Wheel Speed Sensor.

C1223 Lexus Code - ABS Control System Malfunction
Read more: https://www.autocodes.com/c1223_lexus.html

C1201 Lexus Code - Engine Control System Malfunction
Read more: https://www.autocodes.com/c1201_lexus.html

C0205 Lexus Code - Left Front Wheel Speed Sensor Signal Malfunction
Read more: https://www.autocodes.com/c0205_lexus.html

Answer 2

The abs system is most likely bad. 

the whole abs system will need to be check 

see picture below, start by checking the fuses.