Got the alternator replaced with a non-OEM one for £564. Batteries where tested and where fine so its likely this alternator could of been failing for some time.
Had the same issue with a reman denso alternator that went in a Honda, it was the cheap diode/rectifier pack that was fitted that was causing the bat light to stay on.
Bosch is still the gold standard but not what it used to be. Don't buy cheap junk.
Had the same issue with my -07 Volvo v50 (it has a ford engine). Swapped the alternator and the problem was gone.
you can go on rockauto.com and should be able to purchase an OEM Denso Alternator.
If you are going to get a new or remanufactured alternator spend the $$$ for a DENSO one.
Stick with a high quality oem replacement alternator; VW installed a number alternator oem brands (bosch, Valeo, Hitachi, etc). My 2002 New Beetle Turbo S; had a Valeo 120 Amp unit installed, I had a hard time finding a Valeo unit, so I went with Bosch and so far, I have not any issues with it but the body of the alternator, was slightly bigger, so the wiring harness, was a bit of a tight fit.
When I had mine I had to replace the alternator just outside of warranty.
My 540i at 141k started eating me alive, Alternator blew up
I replaced my original alternator (which is also denso out of the factory) with a brand new denso alternator. Should be the exact same thing as the factory alt. It's not working at all. Battery is not staying charged. Had a complete diagnostic done by Honda and they said it is the alt. Kinda disappointed I waisted $700.
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