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As far as I am aware there is no fuse or relay that could fail and affect injectors 1 and 2 exclusively. However, the failure of components within the ECU could cause this behavior. The plugs usually have a story to tell regardless of the issue. Personally the first thing I would do is take a close look at all the plugs, inspecting the color, condition and checking for the presence of fuel or oil. The shop will be able to track down your issue, curious to hear what the results are.
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