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I think what it was, was that my turbo auxillary pump had gone out and was throwing a 20A502 open circuit short to ground code, which doesnt show on my Generic P Code scanner. And after about a maybe a week and half I noticed I wasnt hearing my coolant running after the car was shutoff so I hooked up my bmw specific scanner and that code was there. So i ordered another pump but continued to drive it with the code. I think over the course of 2.5 weeks and 2mile commutes to work and the 1week of just sitting waiting for waterpumps and new radiator hoses, the battery was drained and weak. I had a buddy tell me that an open circuit will drain a battery fast. In short, I trickle charged it for 2 nights and everything is fine now. drives normal.
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