Getting the following codes (via Launch X-431 scanner):

035 O2 sensor regulation mixture too lean
084 Idle/partial self adaptation of short term out of range

Any idea what could cause this?

Mass air flow sensor, vacuum leak, fuel pressure problem.

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Thank you.
No leak, fuel pressure ok, so the MAF is left...
I am trying since days to buy a new MAF, without success... note I live in the Philippines...