2004 Chevy tracker engine light and codes

New here, go easy on me please. Thanks in advance. Northern NV is my location if there might be shop suggestions.

My kid has a 2004 Chevy Tracker 4x4 V6 with the check engine light that was going on and off for some time. It now stays on. Codes read p0171, p0173, p0174, p0175.

After pouring in a bottle of Rislone and him not driving it, but a half tank, the light didn't go off. He took it to a shop that doesn't smog. They did oil change (at his request) and oil filter, air filter replacement, fuel induction service, and apparently checked the o2 sensors and found them operating.

MAF changed in the last 6 years. It's failed smogs before, had new plugs, MAF and such and passed. It seems that each year we have to renew registration and smog, this happens and it's not the first time we got these codes.

So, I'm looking for the most financially affordable options. Kid is a full time student, I'm on disability. $600 was just spent on the above listed services.