Did the SES light go off by itself or after you rebuilt the Disa valve with Gas components?

P0171 and P0174 are generic OBD II codes indicating a lean condition in Bank 1 and Bank 2. Lean condition can be due to vacuum leaks or low fuel pressure.

I would look at the rubber intake boot to see if perhaps that is the source of your vacuum leak.

Here's a video on the Disa valve. He also points to the rubber boot in the video.

Misfire Faults and Umetered Air Leaks BMW 3 Series, X3, X5 with M54 engine - YouTube

Hey I see that you live in Crook County also.

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