Acc sensor issue

[AVR79]

I have a 2014 Alpina B7. To make a long story short, my acc sensor malfunctioned because of corrosion. While it was still under warranty, local dealers said it was because the bracket holding the sensor was bent. Which in turn voided the warranty. And the price tag for a new sensor, $5,000.00.

I have tried sensors off of eBay for less money with no luck. I replaced my wiring harness that plug into the acc sensor. With no luck. I did notice corrosion on the connection that is on the passengers headlight. I'm not sure if I should replace were that leads or what. Any help would be much appreciated.