P0430? What to do?

[Steelepuls]

BB, don’t jump too fast at changing the o2 sensors. I had p043 codes as well and I instantly jumped to changing all four o2 sensors, which didn’t solve the problem. It took about 1 1/2 years of messing with 2- AOS, oil filler tube, and various vacuum leaks on the intake manifold. I would clear it and it would go away for about 200-300 miles but would come back with p0430, p1130, p1128, p1133 codes. I finally found cracks on the oil filler cap Oring that probably contributed to the codes and also cracks on the gas cap. Since replacing both caps I’ve not had a code in six months and 5k miles. Not saying it was only the oil and fuel caps, but rather start looking at the small stuff first before jumping to the o2 sensors and the cats. My 2 cents.