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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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