Alternator Denso or OEM BMW
Get it from rock auto. Remanned Denso. Been using it works good
I would go with a Denso remanufactured alternator. I've used the Advance Auto alternators in a Honda Odyssey, Lexus IS250 and my '08 TL. They all failed within 2 years. I don't think Auto Zone parts are any better than Advanced Auto's. The Denso has lasted 3 years and is still going.
My local NAPA had [Denso remanufactured alternators in stock](https://www.napaonline.com/en/p/DEN2100511), vs the standard parts store brands everyone else carries. They're about $200+core, so a bit more expensive, but cheaper than Honda
My alternator went and I never had any lights, just weird electrical gremlins and batteries dying. Replaced it myself, took maybe 2 hours and the part was like $150 after the core return
Got a Denso Reman, and my mechanic installed it and kept the car for a week to test. So far so good.
He commented that before the alternator replacement, volts would go low when the engine was warm. Now they're pretty stable.
These cars have a lot of electronics. A cheap alternator might not be able to handle the load as well. I sell parts for a living and definitely recommend going with a denso instead.
I used a Denso re-manufactured unit through Napa on a 2014 Camry a few years ago. Many short trips as it gotten 4 teenagers through high school. Still going strong.
I went with a reman denso and it's been a while but I swear I remember reading the remans were better than new.
Defective alternator. Get it exchanged under warranty. Unfortunately, lots of remanufactured alternators from parts stores don't perform up to spec. It would best to get a new or remanufactured from Hyundai or a reliable brand such as Denso.
Im going to say OEM. I have a 2004 acura tsx, which is essentially an accord. I replaced my alternator with a denso remanufactured unit from rockauto. It worked, but the battery light stayed on. I bit the bullet and bought an OEM a year later just to turn the damn light off.
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