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The two banks of injectors are internally wired to the same point. All are in parallel and fire at the same time.
The manuals do have "some" trouble shooting sections, but nothing like the manuals for Ford etc. JDSporsche.com may have some more info, but frankly if we don't talk about it once a week on one of the forums it likely isn't a trouble area.
Porsche didn't plan this car around fixing items as they break, or enough of them break to cause a problem. Porsche expected the cars to be SERVICED replacing parts well ahead of failure. Spooky to think what that would cost.
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