My X5 didn't trigger any codes, but I did get a rough idle at times and the whistling sound. I brought my car in supposedly for a CCV install but the indy mech found that my CCV is fairly new and the updated version. He however found that my intake lower MAF Intake elbow was cracked and that the DISA was broken. I asked him to go ahead and replace which cost me about $230 in parts (DISA and MAF tube) plus $50 in labor since I didn't have the time to do it myself. Overall, I feel that the car idles much better.

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|North Jersey|6SpdMT|04e53|Resonator - Free|Clarion NX700 Nav/BT/DVD|
:Sigma Auto:driving towards perfection...