Code P0126 is: "Insufficient Coolant Temperature for Stable Operation" You can have a bad temp sensor or a stuck open thermostat.
Trouble code P1784 means: Pressure switch circuit: LR
Trouble code P0730 means:Incorrect gear ratio
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0650 means:Malfunction indicator lamp control circuit malfunction
P0126 is and does point towards a faulty Thermostat (stuck open).
Trouble code P0780 means: Shift malfunction
Trouble code P0602 means:Control module programming error
Trouble code P1259 means: VTEC SYSTEM B1 FAILURE
and how to fix it?
Diagnostic trouble code
Trouble code P0304 means:Cylinder 4 misfire detected
Trouble code P1281 means: Cooling System Performance