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Remove old IAC and shake it. If it doesn't rattle, it's stuck or gooey. Blast it through the airway with brake or MAF cleaner while shaking it. This fixed a long-standing fuel trim/O2 sensor code (M54) that popped up weekly.
If it has truly failed, pop for the OE part. The $25 Chinesium parts on the hamazon are junk.
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2001 E53 M54 5MT Oxford green over crusty black leather
2014 F30 N55 6MT mineral gray over red leather
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