my check engine light is on ,has been for a while, now my car failed smog test on 2000 Toyota Echo

AIR INJECTION - filed diagnostic test said, mass air flow circut+ air temp.sensor circut

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2 answers 1 comment
you need to have circuits tested to start with and if good test sensors.are they unpluged or have corrision on them
Agree with #1....you can clean the MAF sensor yourself.
take out the MAF, clean it inside , the 2 resistors , spray in brake cleaner, use "Q" tip to wipe off, let it air dry, 10-15 minutes. then disconnect battery or reset codes with code checker, car should run fine and chk light out. I dont know anything about smog test, we don't have that here in Canada. SORRY