1996 Lexus es300 check engine codes?? o2 sensor? reset light?

Trying to get my car back together. i got a code of P0135 ( bank 1 sensor 1) for the o2 sensor heater but i don’t know if it is upstream or downstream. also a code came of P0401 for egr flow insufficient? i’m lost with that one. also if anyone knows how i can at least reset my check engine light. i’ve…

replace both of them

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