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Old 22-09-2019, 10:52 AM
HenryM HenryM is offline
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Join Date: Jul 2019
Location: Seoul
Posts: 5
Default HFS4 coil whine when set to DR1

Hello Richard,

I sent you an email about a month ago but haven't received a reply so I'm posting on this forum.

I have a 2011 BMW 335i with N55 PWG engine and I've got a few questions for you:


When the CEL jumper is set to DR1, the controller board makes a loud buzzing noise as soon as I insert the key.
The noise won't stop until pulling out the jumper from DR1.
I would like to know if this is normal. Everything else works fine if I set it to DR0.

Last edited by HenryM; 20-11-2019 at 12:29 PM.
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