Need help with codes

New member here looking for help. I have a 2003 Tundra Trd access cab with 130k miles. Timing belt, water pump, coil paks, LCAs and some other stuff has been done.

It had aftermarket exhaust but the muffler was completely rusted through. It kept throwing emissions codes. I replaced the muffler and there are no leaks. After replacing the muffler it idled super low and would die if you slow rolled a stop sign. I cleaned the throttle body which was pretty dirty and now it idles good and runs better then it ever has.

I was driving home from work and the check engine light came on. Hook up the scan tool and it threw p0420 p0430 p0441 p0443 and p0446. I got fueled up the day prior and pretty sure the cap was on all the way. I was just wondering if you guys had any tips/tricks in diagnosing the codes. Thanks

 

Those are all emission codes.

Check for cracks in the charcoal canister, exhaust leaks, intake leakes.

Smoke testing the engine might be an easier way to find out if everything is leak free.

 

@koditten nailed it. Smoke test.