Good evening all I have a problem with my number 3 injector on the iidt tool live values it is saying +6 and I have a missfire so am looking at replacing the injector I have put red X in ect but no joy can any body tell me if the injector needs coding or is it just fit and forget also if I fit a second hand one will this need coding cheers all

I am guessing you have watched ed china diagnose the loom by using a test injector?

good call first on the TD6, if the injector wiring is faulty it can throw up a code even if the injector itself is OK. good place to start is to check the injector wiring loom, it is a lot easier to swap out than a duff injector too. There is nothing that can't be fixed with a hammer😜😜
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How do I check the injector loom

I may have a spare injector lying about, will need a refurb but will mean you can stay mobile

Steveo
looks like Ed continuity checked the wiring with a meter

Injectors are not coded so it's plug and play........... provided that you can get them out............. they can be a bit of a pain  Yesterday I couldn't spell Engineer... Today I are one!
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try swapping the wiring conections over from injector 3 to 2 then check to see if the fault has moved injector. if theres enough freeplay in the wiring that is, if it moves its a wiring fault.