2001 Audi A6 2.7T Check Engine Light On After CA Smog Test (P1130 Code?)

My 2001 Audi A6 2.7T's check engine light came on several hours after passing a California smog test. I initially suspected that the testing process may have damaged a component. The local Audi dealership offered to run a diagnostic and suggested they inspect the system themselves. They performed a diagnostic scan and turned off the check engine light. Their report indicates: ------------------------------------------- MIL is commanded ON. Emissions-Related Powertrain DTCs, Mode 3: P1130 - Manufacturer-specific code (Long-term fuel trim, Bank 2, system too lean) Continuously Monitored Systems DTCs, Mode 7: No Diagnostic Trouble Codes recorded. ------------------------------------------- I'm seeking clarification on what this P1130 code means and whether it requires any action. The dealer charges $166 for the diagnostic test—last time I had a similar service on another vehicle, I ended up paying $110 for a new gas cap (and the test itself). The vehicle has only 60 miles since the smog test, and the check engine light has remained off. This is the first smog test for the car, with approximately 26,000 miles on the odometer. It features a 6-speed manual transmission. Any insights or recommended next steps would be greatly appreciated. Best regards, BGunn