System too lean Code p0171

[Mr.kevz]

Hey Fam! My 19 GT w/ 22k+ miles threw a P0171 CEL light saying “system too lean” this weekend while merging on a freeway. I cleared the code thinking maybe it was just bad gas. CEL popped again after filling up gas and another freeway drive. I already checked my intake , cleaned my MAF sensor and removed my catch can just to make sure it’s not causing the vacuum leak. What else could i check? The latest i can take the car to the dealer is 2 weeks due to their schedule. My car has lund tune, jlt cai, stainless works LTH, borla catback. Any inputs would be greatly appreciated.

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[Fetlock]

It could be an 02 sensor, or maybe a leak in the exhaust system since that has been swapped. If you have an odb2 reader, I would watch those 02 readings.