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Hi,That will usually be an issue with the cam phasing solenoid, specifically the electrical resistance across it reading open circuit.Did you have the key on while you were doing the tune up? If so, have you tried resetting the light to see if it comes back?
If not... check for loose/unplugged connectors you may have missed by accident... specifically around the front (belt end) of the engine, up top near the coils.
I'm assuming you found it was unplugged/pinched/etc or that it was from having the key on. If you need more help though just let me know.