2008 Audi A4 Quattro with 82K Miles: P2293 Code Causes Sulfur Smell and Engine Light (Recall Possible?)

My 2008 Audi A4 Quattro (82,000 miles) started exhibiting a sulfur-like odor during acceleration, accompanied by the check engine light. The issue temporarily resolves after restarting the vehicle. A thorough inspection revealed a significant evaporative system air leak, which was resolved by replacing the purge valve. However, the shop technician mentioned a potential recall related to soft camshaft components that could be contributing to this problem. Another mechanic suggested that the entire evaporative emissions system might need replacement. Despite these concerns, the car runs smoothly otherwise. Does the P2293 diagnostic code still matter even if symptoms resolve after restart? I'm seeking clarity on whether this code indicates a serious underlying issue or if it's just a false positive.