2JZGE into SC4. Here's my test. What should I start with? No Check Engine Light, but still maybe O2 sensor? Or Cats? Just need to get tags and dont wanna go bootleg smog

 

definitely start with o2 sensors but most likely the cats do tend to go out and be bad to fail a smog

 

move to a state without smog!
like OHIO hahaha
only good thing about ohio

but check O2 sensors, change spark plugs, air filter, cap/rotor

 

DAMNIT! I wanted to take a look at which pulley is potentially causing my terrible squealing since I have a smaller belt on. I had to delete the A/C pulley after it seized last year, and since then the belt has stopped playing nice, and now takes forever to warm up enough to shut up.

So yeah... popped the hood, notice a plug next to the alternator just chillin by itself. "Hmm wonder where that goes? Hey look, there's the O2 Sensor I need to swap out so i can pass smog... Oh... look, its not plugged in either..." [/plugs O2 sensor into above mentioned plug]

SMH, hopefully that's the only reason I failed smog.

 

Good luck! Did you get directed to a STAR Test Only? :/

 

o2's. high HC and CO2 could also be cats but since you have abnormally low Nox, that indicates you have very low combustion temps which means you have a bunch of unburnt fuel cooling the cylinder down. insert o2's and try again.

 

I tried doing a smog today on my sc300 I passed everything except apparently timing so they failed me and told me they did not know if it was at 10 degees or not and I asked so why the **** I fail then if I passed everything but failed me because you don't know if my timing is on point. taking it to another shop to smog ohh and aperently I cant have a stock 96 sc300 air intake on it . it has to be of the same year of my car which is 95

 

that is odd they can't check the timing, its pretty easy to do on a 95 or a 96