2011 Honda Pilot 4WD shows P0325 code but only until the car warms up (10 mins/1 mile). Reset with OBDII the code does NOT come back on. 87 octane gas from many stations in a 50 mile radius. Code does not come on under load or up an incline after warm-up but once cooled down will trip again. Not a problem if you keep an OBDII in the car and reset it once every start-up but would like to know the cause. Lean air/fuel ratio before warm up, ECU to knock sensor problem, harness wires are good and no other mechanical problems noted. Crazy as it sounds I've got a 2006 Toyota Tundra that is doing exactly the same thing. 4.7l engine that uses 93 octane at all times. Have not seen this problem in any forum or on YouTube but I've got 2 vehicles doing the exact same thing. Computer diagnostics is $$$ and repair on both requires removing the intake manifold...also $$$.