Yes there's a chance i bumped into things. i had a hard time sliding my new heat shield in and out. although my hands and the shield were only the ABS side of the K&N shield. the only items i could see that i had to worry about was the ABS brake lines. i can't rule out that i did not elbow or bump into something.
I'm not sure where my fuel injector is or what it looks like. maybe i'll bug Ansel to give my engine area a visual once over.
Maybe Mike, i really don't know
I did do 3 things directly before seeing the CEL. Remodded, filled up at a different gas station, reset the cu
i did read on howstuffworks.com how the MAF sensor works. according to the interweb, new model subarus , heat up a wire to a given tempature, and then it reports to the ecu how much voltage is required to heat up that wire to what ever given temp they use. so if your intake system cools that wire down more then the stock system, it reports a higher voltage. if your intake system does not cool down the wire as much as stock , then it reports a lower voltage. (more reasoning why everyone was correct that changing the intake requires a tune, or going back to stock)