My brother was driving the RS and the knock sensor went bad a couple weeks ago. He took it in to fix it today an they charged him $80 for the sensor and $80 for labor. They even fixed it without consent. (he brought it in to read the CEL and they brought the car back with a bill and a replaced sensor) The car has 38k miles and is a 2001. Shouldn't the sensor fall under powertrain? Thanks.
~~Quentin