I wouldn't go celebrating just yet. You haven't really identifed either the problem or the fix, so be prepared for it to come back. If you head off to the inspection station to soon, odds are Murphy will be waiting for you there to turn the Check Engine light on again just as you pull up.

If things mysteriously changed after being under the hood, you likely disturbed a poor wire connection, perhaps a ground like at the fuel rail, or even a slightly loose pin in a connector, even a broken wire with the insulation still intact. Changed weather conditions like humidity and temperature can affect weak contacts, especially grounds, as can conditions under the hood.

Disconnecting the AMM doesn't clear OBD codes. It's simplest to clear the codes at the diagnostic connector after reading all the stored codes. Read them twice until all codes repeat to be sure you got them correctly. Remember to do both ports 2 & 6. You'll soon remember the simple procedure if you do it often enough. If you can't soon figure out the problem from the code, then reset the codes and wait for them to come back, either immediately or over the next few days. The condition that set the code may have been transitory and has now gone away. An example of a transitory condition might be an OBD fuel trim code set during extreme stumbling and stalling at very low rpm simply caused by incorrect idle conditions or loose ignition wires that have now been dealt with.

Disconnecting the battery for a moment also works. Many people prefer this method as it's easy to remember and clears everying at the same time, especially those people who don't use the diagnostic connector often enough and find it a nuisance. Note that disconnecting the battery will also clear settings like radio tuner programming, clocks and needing to re-enter radio codes, also resetting the ECU adaptive fuel trim program (no big deal, over a number of starts, like the next 16, it will have learned a full new set of adaptive program settings). Another way to reset codes without affecting clocks and radio settings is to interrupt power to the controllers using their fuses.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now