Hi all
I have just done the systems check mode on my car as per the training wrx book and all was ok. But instead of disconnecting the two green plugs, i undid the blue one and upon my malfunctioned brain realizing its error, quickly put it back together and disconnected the correct one!
Now the check engine light is on so i have disconnected the battery and intend to leave it off for 1 hour. Will this clear it? I know this is how you reset the ecu?

Please help a spanner who has errored!!!

Johnny