i bought the k+n typhone, and followed the directions. but my check engine light came on. went through everything again. the light came back on so i then i brought the car to auto zone to decode the problem. the results said "running lean bank one". i told K+N about the problem and the said to run the car for about 100 miles reset the ecu and run it some more and the light should not come on. it did and they told me to bring it to toyota. i dont have the cash or know how to do it myself. anyone have this problem or knows what i can do, anything will be a big help thanx.