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They can diagnose bad injectors without replacing the plugs. But generally the techs diagnose bad injectors by removing the plugs and looking if they are wet especially on the threads.
So if you’ve already removed them, why not replace....
But I’ve gone done this road and didn’t have the plugs replaced. Diy then myself on both the n63tu and s63 I own. Plugs are a diy. But the price seems in ball park for a v8 at the dealer, I think I was quoted 700 or so. The parts department prices on plugs are damn high, on the v8. It should be 1-2 hrs labor.
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