Toyota Celica woes

OP here

Scanner shows EGR system fail and LEFT SUB 02S SIG

First one is obvious, but wonder what the 2nd one is

It means you're a leftist subhuman.

Upboated ;)

sounds like an o2 sensor

Before you go through all the trouble of removing your transmission, try disassembling your shifter linkages and look for worn down parts. This is a lot cheaper and easier to fix than a problem with the transmission's internals.

Thank you to everyone that gave me legitimate advice. I'm going to clean the egr valve tomorrow since I have no school tomorrow, and I'll see what happens.

I already have a guide looked up on the celica forums with pictures, so I will follow it and decide if either the valve needs replaced or just cleaned.

Glad to hear that you got some help.
Stop posting and lurk more.

Seriously, i've seen the same posts on this website and people actually help. Why am I unlucky to be shitted on for just learning how to maintain my car?

If you have to ask a question like that. That's why.
We have /qtddtot/ for posts like this. And as stated above, you'd get better advice from actual owners of the car on a more specialized website.

Always start with the low hanging fruit. You did an ignition tune up, which is good. Try a new fuel filter next, or clean/replace your injectors if you're feeling adventurous