Disa and CCV question
 

OK, first off hello to everybody! I am the happy owner of a new to me 2001 X5, 3.0. I feel that I got it for a steal and have been fixing little odds and ends but now I have a question concerning two of the more talked about issues. I recently got the 0171, 0174 and 0313 codes. Too lean on the cyl. banks and fuel level too low. So, I ordered the DISA rebuild from GAS. The SES light went out on it's own! Did I make the right move? Should I have waited for the SES to come back? Should I have done the CCV first? I don't have any idea if these have been changed previously. Any feedback or advice would be great.

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.

If you have higher miles the DISA rebuild kit is a great way to avoid future failures, I'm also thinking about getting their 1 bar coolant expansion tank cap to lower the pressure in the cooling system.

At the least, the new gasket on the DISA will avoid future leaks, but definitely look at that lower intake boot! Very prone to ripping/leaks and will cause lean codes as its a vaccum leak, its only like 18 bucks too so an easy fix!

I have not done the rebuild yet. Parts ar r on their way. I did order the pressure cap from them also. The light went out on it's own without me doing anything. I did replace the small elbow boot to the throttle body already because it was ripped. And yes, I live in Chicago.

OK, so I got my parts from GAS today. Boy what a difference in quality! I installed it all and it fit great! I also got the 1.2 bar coolant cap. But low and behold! You have to see how bad this thing was! The pin holding the top of the flapper fell off when I removed it, the flapper itself was tapped through with a drywall screw to hold it together and the inside of the flapper is rounded out as well as the pin that goes inside of it was broken! Not to mention the o-ring was totally flat and had to be scraped out. This was most definitely a ticking time bomb. Thanks for the help guys. Now on to the CCV valve next!

Here are some pics.