It will not pass the california smog test plus there is no check engine light on on 1992 Toyota Corolla

I want to fix it myself

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2 answers
what are the numbers?? O2 CO2 CO HC NOx, I need to know the numbers at both 15 & 25MPH. also, are there any mechanical/compnent failures indicated on yoi VIR.
What is the reason for the failure of the smog check?