I have 2006 X5 3.0. 99k miles and has been very well cared for. Lately I've been having issues with fuel trim and bad 02 sensors. Changed them both and issue went away. A few weeks later, same problem. Removed catch can (long story about why that's needed) and cleaned it and replaced what appeared to be a faulty drain Valve. Problem solved. Drove it off and on for a few weeks (maybe 100+ miles or so in town) with premium gas. No issues. Today out of the blue it went into failsafe mode with 4x4 light on and 4x4 inop error as well as "yellow" brake light on. Scanned it and it threw aP0461. I cleared it and drove same distance, all issues came back. Scanned again and it threw P1500. All the time, no check engine light. When I went to check MAF (just in case), the whole bellows was loose and hanging off. I reconnected and tightened clamp, drained the catch can and reset ECU. Drove hard around block triple the distance and no issues, no codes. Could that have been my issue all along? And/or could a battery that may be headed south cause a lot of random issues?

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2006 BMW x5 e53, M54, steel grey, black leather, pano roof, cold weather package, avic-z150bh head unit with JL Audio amp and speakers.