Those numbers refer to that piece specifically.
The chassis serial is usually in a plate on the windshield.
Check the owner's manual for instructions on where to locate.
Some scanners to do fault diagnosis, has option of chassis serial information
SOURCE: LEGACY 2.5 AUTO GEARBOX REPLACEMENT
hi there, needs to be the same number. computers need to match. tourque converters are different from 2.0/2.2 to the 2.5 engines. also shift points are different between models so needs to talk to the dash perfectly. hope this helps.
SOURCE: Hi i recently had to replace
If the ECUs have different part numbers, they are NOT the same...The thing will most likely might hook up to your electrical connector and mount the same, but they are different computers for different vehicles that most likely are equipped with different features. i.e. different engines, different engine controls, different emissions controls, one may have cruise control and the other not or they may be for the same engine with a different transmission, etc..
I am curious however as to how this all came about. The ECU failed from attempting to start the new engine??? What was wrong with your engine that it needed to be replaced and how did the ECU manage to fail because of an engine replacement? Was the other engine running when it was determined that it needed replacing? ECUs don't fail very often...I'd like to know what the problem is.
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