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Hey guys, not sure if this is the right place for this but I'm relatively new to all this. CEL came on with two codes about bank 1 running lean and when I was reading the live data while driving, I found short term fuel trim was maxed at 35% and the lamda value shot up to 1.382 whenever the engine was under load and occasionally at idle but tapping the gas a couple times brought it back down to regular trims and equivalency went back to 1. I am on a somewhat tight budget and do not have the funds to start replacing everything that could be the issue, any common culprits that I could check before taking it to my mechanic to get his opinion? Thanks for any help
For reference its a 2007 subaru impreza outback sport w/ 200,000 miles
 

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First thing I would do is boost leak test the intake tract. If that passes, you could look at MAF readings to see if they are out of whack. Check fuel pressure as well.
 
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