Massive Flow Sensor Problem-2002 Accent

Just heard from my buddy with the 2001 Accent, the one with the defroster problem. He's not worried about the defroster anymore; the Accent is now barely running. He was trying to pass somebody
(!) the other day and the "Check Engine" light, which has been on for a month or so, started flashing and the car lost power.
    He took it to AutoTechPartsAdvanceSpeedZone or something, and they put the scan tool on it. He doesn't have the codes, but they said:
"Mass Air Flow Sensor"
"Misfire Cylinders 1, 2, 3"
"Main Catalyst Below Threshold"
"Bank 1"
    OK, it's a little garbled... but MAF sensor bad, causing bad mixture, misfires and emission control problem wouldn't seem too far off the mark at first glance.
    However, it's not my area of expertise. I would welcome any advice or suggestions as to what to check or how to proceed.
    Right now, the course of action if I don't get more info either here or on Google is to replace the MAF. Unless I find a dead mouse in the air filter or something. This car has not had regular maintenance. He wants to drive it to Florida next week....
    The parts place wanted to know what engine he has; the VIN is KMHCF35GX1U12xxxx. If nobody knows off the top of their head, I will try the Hyundai site but it only works with Windows so is not simple for me the next few days.
    Thanks to anybody for assistance!
PB
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Plague Boy wrote:
<I'm not going to snip, just this once> The car seems to be fixed. He couldn't get the MAF until Tuesday, so we decided to go ahead with the new plugs, wires, and air filter that I have been recommending for *months*.
    Air filter was very dirty; vacuumed out the box while it was open because it was full of debris. Sprayed the MAF with "Zero residue cleaner" for tape decks and sprayed the contacts of the connector (looked OK) with contact cleaner.
Removed the old plugs (looked old, but not too bad) and replaced with new Bosch Platinum Plus. Went smoothly.
    Two ignition wires broke when I removed them (connector remained on spark plug) and replaced with four new wires.
    Fired it up, and it seemed better. So we drove over to AdvanceSuperCenterPartPlaceZone to pick up oil. The MIL was on, but steady, on the way over. Ran the scan tool, and the MAF code was gone, but the ones for the misfire(P0300, 301 etc.) were still stored. Cleared the codes, and the MIL went out and stayed out.
    So I changed the oil, because there was something...odd...about the oil. I thought maybe it was diluted with gas, which is what the guy at the parts place said something about.
    So, since I didn't try the engine after each step, I don't know which thing actually fixed the problem. My guess is the wires were bad. Still, all "routine maintenance" and good to be done. Friend is very happy to not blow $100+ on MAF and says car runs better than ever since he bought it. I'm happy, because I have a bitch now to shovel my driveway this winter <g>.

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I'm betting the catalyst efficiency code will come back. Driving a car while the engine is badly misfiring (indicated by a flashing check engine lamp) will typically cause catalyst damage.
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hyundaitech wrote:

    Well, the MIL has stayed off as of today....we'll see what happens. He's going to drive the car to FL Thursday.
    Thanks for the reply.
PB
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Plague Boy wrote:

He picked me up and took me to the airport Dec. 19th. Check engine light was on, I noticed. I presume he's still in FL but I will see how it went when he gets back and post anything interesting.
PB
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