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It's not so much 'coding', more like calibrating of the ECU. The car will run fine without the new injector being coded, but not 'perfect'. If you have a leaking or sticking injector then you will definitely see a big improvement even without having the new one coded. If you have a friendly parts supplier they might be able to cherry-pick the injector which has the closest flow rate to the removed injector.
And yes, it's an easy job. The most time consuming part is getting the scuttle panel out so you can get the plug cover off. You might aswell do the spark plugs while you're in there if they haven't already been done recently.
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