Tech1984 - Hey thanks for the reply. I took the wipers off, then the plastic cowl piece, then the wiper motor assembly and finally the lower stamped metal cowl tray.
Disconnected the coil pack connector, removed the 10mm bolt and pulled the coil pack and tube.
But, the plug socket would not go onto the plug as there is an other tube going down to the spark plug and covers the area over the hex nut on the plug.
I could not see how to remove it. It is very securely mounted and will not budge.
I did not force anything and gave up at that point and replaced everything.
I like to do things myself and have a nice set up in my garage to work on cars/motorcycles.
I have never been defeated like this in just replacing spark plugs.
I there another trick that I need to know? It looked to me that maybe the top of what I will call the valve cover may need removal also.
Is it possible that you could advise me on the final step. I have the plugs and the torque specs.
Like you said the Prius plugs will clean themselves and in the 8 weeks since the mpg went from 61 to 45 mpg after only topping the tank off with a little over three gallons added. It has slowly improved to 55 mpg.
It is taking too long and I purchased the plugs to speed things up.
I'm 70 but I enjoy learning about my vehicles and doing the services as I said.
It never threw a code but it was clear that the efficiency of the injectors and plugs went down. A couple of fill ups with injector cleaner got it up 4 mpg right away. That confirmed to me that it was a result of bad fuel.
The gradual improvement after that also confirms that and the fact that the plugs will recover.
Here's a picture of the back of my garage where I putter around. The motorcycle just had an oil cooler install.