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first question is how is the oil level and condition? after that i would start by swapping parts, swap cam sensors from one bank to the other and clear faults, if that doesnt do anything swap solenoids from one bank to the other. if it doesnt move after either of those i would check signals and wiring from components back to dme comparing it to bank 1 that doesnt have faults. after that would be pulling valve cover and checking timing.
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