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Fiddlebog · 11-08-2019, 12:49 PM

So I understand the compatibility issue with ECU/Immobilizer/keychip.
I also understand that certain years are compatible with certain engines (i.e.: a '99 cannot have an '03 motor put in it)
My question is: If the ECU/Imob/key is replaced with one from a certain year, can an engine from that year be used? Or am I overlooking something else?
i.e.: could I put a 2003 ECU and a 2003 engine in a '99 Boxster and have that work?
Additionally, I understand that the 2000 and 2001 models are backwards-compatible with the 2.5L engine, so could I put a 2001 ECU in a car from '99 or earlier?

11-08-2019, 12:49 PM	#1
Fiddlebog Registered User Join Date: Aug 2019 Location: Texas Posts: 177	Engine/ECU compatibility So I understand the compatibility issue with ECU/Immobilizer/keychip. I also understand that certain years are compatible with certain engines (i.e.: a '99 cannot have an '03 motor put in it) My question is: If the ECU/Imob/key is replaced with one from a certain year, can an engine from that year be used? Or am I overlooking something else? i.e.: could I put a 2003 ECU and a 2003 engine in a '99 Boxster and have that work? Additionally, I understand that the 2000 and 2001 models are backwards-compatible with the 2.5L engine, so could I put a 2001 ECU in a car from '99 or earlier? __________________ '97 - Silver (rebuilt/stripping) '99 - Black (rebuilt/sold) '01 S - Rainforest Green (daily) '03 S - Orient Red (sold)