Looking for the location of the knock sensor. Everything I see on YouTube for Legacy/Outback seems to be prior to 6th generation showing knock sensor is located under the throttle body towards the back of engine. Not seeing it. Went to Subaru and Parts dept brought up two different engine diagrams; showing it in different places. 4 cylinder is only supposed to have one. Looking at the engine, it appears to be towards the front of the block sitting between the alternator and AC compressor. Anybody help with precise location?