If the zed has an upto date service history a P1 with new spark plugs.
Mine is an 05 too and in for the same this year.
P1, P2, P1, P3 and back to P1 on year 5.
Ps I went for a P2 not P3 last year coz as said by others the service sheet shows no difference on the zed between P2/P3