All 3 worked fine but one gave me code P2311. All spark plugs are new and working. First I have a problem with the D coil, then I switch the coil to the next bank and the problem persists as the coil A skips. Replaced the old coil, everything works. I noticed that 3 coils have green markings but the one that doesn't work has no green markings. I can't say it's used, but I can say it's a manufacturing defect. 🤷🏼♂️
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