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Cam sensors are the usual culprits and more often than not you'll get the symptoms without having a simgle code.
Miles on engine?
Original CPS?
OEM grade CPS?
Only use OEM cam sensors or you will have mystery headaches. When mine and then wife's intake CPS failed, we had occasional codes but none were CPS related just random cylinder misfire etc.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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