I have a Code 25, Knock Sensor. I R&R'd Knock Sensor with a new one and still have Code 25. I have also replaced 4 spark plugs. Is a new ECU the next step? I also have a 2005 R12X Aquatrax. Can I swap ECU's? They have different part numbers and different connections. Can I replace the wiring harness in the 2002 with the 2005 harness and use the 2005 ECU? Any other suggestions?