"had same code"
What is this code? I'm not sure you understand what I mean by "factory."
Factory means a part obtained through the vehicle manufacturer's (Hyundai
in this case) distribution network (in the U.S., that would be a Hyundai
dealer) and in the vehicle manufacturer's packaging.
For checking the air flow sensor, you'll be interested in technical
service bulletin 01-36-022. You can view it at www.hmaservice.com--
you'll need to register for an account if you don't have one. It gives
specifications for normal air flow readings. This TSB was intended for
diagnosing a P1128 code, so instead of MAF readings that are too low,
you'll be looking for MAF readings that may be too high.
Unfortunately, there's little good way to test an oxygen sensor in the
field. Checking for normal fluctuation between 0 and 1 Volt (a certain
number of high and low switches in a certain period of time) is the best a
mechanic can typically do. But as I said previously, meeting these
criteria doesn't mean the sensor is good. Beyond that, the only other
option we'd have without some sort of sensor-testing apparatus would be to
replace the sensor with one known to work properly.
--
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