u/Deep-Wrongdoer4194

Bought the car from my dad who had it sitting for a long time,it had no check engine light or any issues before he parked it for years.

Right now i have a check engine code for po420,po430 and po440,i know the po440 could be a loose gas cap and it comes and goes but what im struggling with mostly is po420 and po430,i been driving the car for around 3 months already and used cataclean once which seemed to calm down how often the check engine light comes on.

I did some research and apparently a bad brake booster(i can hear hissing under the dash when pressing and letting go of the brake)could trigger those check engine lights.

Anyone had these issues before?any ideas?or im i just fucked and i have to get new get cats?