My son came home and said."dad...lights are on again". We just had the steering angle sensor and yaw sensor done. This time the 4x4 light and the brake light came on along with a message "engine failsafe mode". I ran a scan and it said engine idle control valve stuck open. Cleared codes and all lights went out. Seeming that none of these seem to have anything to do with the other and the car was running fine...could it simply by a battery that's going low?

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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.