Hey Everyone. I got a 89 supra turbo. Had Forum member evolution read my engine codes and the code 52 or something showed up. Checked that it might be the knock sensor? Is this easy to fix and also where the hell is it located? I want to fix it asap because it annoys me how the check engine light is on and I am getting horrible gas milege. I know it's not the o2 sensor and plugs because I just replaced them a month ago.