Make sure you buy the original part, or at least a good OEM brand, Made in Germany. The original part is made by Siemens. You might find some made by Behr. If it's made in Germany it's OK. If it's made in China it can fail quickly again. Don't skimp on it.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.