Well, somehow I messed up my 'teg ECU for my ZC. The check engine light would come on for a bit, then go out for a bit, while driving only, without giving any codes.
So I went and got another one from the wrecking yard. However, the lables on them are slightly different. Does anyone know what the difference between these two are?

Here's what the old one looks like:

B 18
37820-PG7-L020
684-103225 8Y

And the new one:

37820-PG7-L031
684-111849 K30 8Y


I'm wondering if they came from different years or models or what???

The new one works, but it seems to be lacking a bit of power...

Thanks!
Eric