I don’t think changing the plugs or normal service items will cure many of the fault codes thrown up by the PCM. The diagnosis and solutions to your problem are shown in the link earlier in this thread. https://www.troublecodes.net/p2codes/p2009/’ , it’s worth buying yourself a cheap multimeter rather than trusting the fault finding to a garage who will inevitably charge you for hours of labour at an extortionate rate and maybe not finding the cause of the code. Don’t go down the road of changing parts until you know exactly where the problem is, you just waste time and money.