My buddy has a 97-01 Prelude VTEC (non-SH) and he has a CEL. I helped him find the OBDII port and he scanned it using the free tool from Auto-Zone. The scanner is throwing the code, P0325 Knock Sensor Circuit Malfunction. Anyway, the Honda dealer charged him $90 for inspection and said it was the catalytic converter. Im trying to help him rule out the less expensive thing first, so are there any suggestions to see if the knock sensor is messed up? Also, if someone could post a picture of where it is, that'd be GREAT. I searched this forum and saw a Bseries which was located right above the oil filter, so would it be near there too on a Hseries? If it isnt that and ends up being the cat, are there alternatives to using the $500 OEM ones? BTW, we're in CA so theyre pretty anal. Thanks a bunch.