Hi there! I am trying to fix my moms GX. The VSC off, VSC trac, and anti skid lights are on plus the check engine light. It’s throwing P0430 and P0420 codes. I have already changed the downstream o2 sensors, checked the MAF sensor, checked fuses, and made sure the air filter was clean. Still has not cleared. I already know the code considers it the cats but everywhere I’ve looked says that is 9/10 not the issue so I want to do everything I can before spending thousands on cats. Thank you ahead for any help!