2006 550i (intermittent teapot whistling noise) @ cold engine start
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My 545i sounded like a teapot. Had these replaced and it fixed the problem.
Repair kit, pressure regulating valve Search ES18560 - 11127547058 - Pressure Regulator Valve Repair Kit - ES#18560
Repair kit, pressure regulating valve Search ES18560 - 11127547058 - Pressure Regulator Valve Repair Kit - ES#18560
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