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P72 is mapped for a 1.8L engine

if you run it on a 2L engine the fuel and ignition maps will be out, thus your engine will run lean and possibly knock

lean fuel mixtured melt pistons, as does...

the P72 is for a 1.8l DOHC VTEC Engine so its the wrong ECU for a B20, doesnt matter if its OBDI or OBDII. In this case it doesnt matter what ECU your running as they will both be wrong.

you...