My 2001 LS430 with 119K has been diagnosed by dealer with a faulty oil control valve, vvt bank 1. I have seen You Tube video of replacement, which seems very straight forward. Removing engine cover detaching wires, and undoing bolt. Pulling out valve control valve and replacing. Dealer wants $350 to replace. OEM part is available from dealers for $150. Has anyone done this repair and are there any additional parts required? Thanks.