check engine light comes on with a code 01074 fuel mixture lean bank 1 on Kia Spectra

Average mileage: 137,333 (102,000–180,000)
Engines affected: 1.8L 4 Cylinder, 2.0L 4 Cylinder
3 model years affected: 2003, 2004, 2007
4 people reported this problem
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problem details
2003 Kia Spectra - 1.8L 4 Cylinder 180,000 mi,
i could not find a solution although i have replaced by genuine parts the PCV valve and evap purge with it's hoses but the problem still their can you guide me to other causes or probable causes of this problem
2004 Kia Spectra - 2.0L 4 Cylinder 102,000 mi,
I have a loss of power. Fuel economy as dirastically gotten worse. I was getting 340 miles per tank of gas. Now im getting 40-45 miles to 1/4 tank gas. I get a strong sulfur smell from the exhaust. I was told its an oxygen sensor or my egr valve. When i had the trouble code read it said i have a bad oxygen sensor or connection. My problem is trying to find out if its the upstream or downstream sensor. Im trying not to buy both as they are around $140-$160 each.