But try to get denso one or oem. Aftermarket ones tend to not last a long time.
The part # for the Alternator (Automatic trans) is 6H903016L and it's made by Bosh. [Europaparts](https://parts.audiusa.com/p/Audi_2012_A4-Base-Sedan-20L-AT-Quattro/Alternator/48001649/06H903016L.html) sell's it for $499.95 (OEM).
I ordered a new denso online then had a mobile mechanic come install it for me in my garage.
Buy a Denso or OEM Honda alternator if you want to do the job once. The cheap Chinese-made brands and auto-parts store brands will die within a year or two. Ask me how I know!
I went through 3 OEM Denso's before going with an OE (Land Rover stamped) Denso. Presto! No more charging light.
I changed out my original Valeo alternator with a Bosch unit at 100k miles. Never had a problem with either one.
I bought a Bosch reman for my X5 about 3 years ago, no issues whatsoever.
Good job OP. I had the battery light turning on/off for months and figured it was the alternator(newish battery). Was about to purchase a reman Denso for $160, but glad I found a video of Timmy the Toolman on youtube before purchasing and went this route. Pretty easy and straightforward.
I used to have an alternator that required me to rev to 5k before the light would go out! My current one needs a slight blip to 1200 to make the light go out. I just ordered a new Bosch rebuilt alternator to replace.
ended up going with a Bosch remanufactured alternator. Installed it today, went super smooth, charged up the battery as I was installing it, got everything buttoned up and started it up. Battery light still on, voltage is at around 11.9 and dropping. Will randomly jump up to 14.4 volts, no correlation with revving the engine or putting a load on the electrical system.
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