Lexus Troubleshooting Questions? Ask a Lexus Expert
The C1201 is not a trouble code. This is an informational code stating that the Trac/VSC system has been temporarily turned off because the Check Engine Light is on. So, fix the reason the Check Engine Light is on, and this code will clear by itself.
The P0302 is a Cylinder Misfire on Cylinder #2. There are a few different things that can cause a single-cylinder misfire. This can be a case of a faulty spark plug, a faulty ignition coil, a faulty or clogged fuel injector, low cylinder compression, etc. More commonly here will be the spark plug or ignition coil, so this will be the best place to start. Pull the spark plug and inspect it for any problems like cracks or a worn diode. If there are any doubts, replace all the plugs. If the plug looks ok, the ignition coil will need to be tested to make sure it is sending spark to the plug correctly. Inspect the electrical connector and wire harness for any loose, broken or damaged wires at this time.
Cylinder #2 is the second from the front.
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If the wiring to the coils has been re-wired and are covered with tape, this very well could be the problem. You will need to remove the tape and make sure the wires and wired correctly and that no wires are touching other wires or touching metal at any point. You should also check the fuses at this time, as the original wiring issue could have blown a fuse. When putting the wires back together, wire nuts are the more preferred method of joining the wires, as they better conduct and insulate. If you found this answer helpful, please help me and leave a rating using the "stars" at the top of the page or click 'accept'.Rating or accepting my answer does not cost you extra. It allows me to be credited for this Q&A.