P2096 code mostly stock

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Corksport TMIC, K&N air intake, Cobb Catback exhaust are the only mods on the car right now. I’ve read this code can be the result of many things. Any suggestion on where to start troubleshooting?

Year/Make/Model: 2011 MS3
Mileage: 107500k
Location:SF Bay Area CA
Concern: CEL and P2096 code
DTC's: P2096 Post Catalyst Fuel Trim System Too Lean Bank 1
Modifications: Corksport TMIC, K&N cold air intake, Cobb Catback exhaust.
ECU/Tuning Software: Stock
Tuner:
Is the concern intermittent? CEL and code just came up. My fuel tank was near empty so I waited to see if that may play any role but after a refuel and was able to test with OBD2, code remains.
Can you duplicate the concern? No
Recent Repairs: None
Correction:
 
Last edited:
Check for intake and exhaust leaks.

How long have mods been on the car
 
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