I had this issue on a Ford Ranger and it drove me nuts. P0445 indicates a failure in the evap system, which manages fuel vapor. The thing is, the entire evap system is usually only a few parts which are the fuel cap, evap canister, and a valve or two.

Best thing to do is test each component including the circuit feeding the purge valve until you find a failure.

My Ranger purge valve failed testing so I bought a new one. The new unit behaved the same as the broken one so I double checked all my tests. Ultimately I came to the same conclusion that the purge valve was bad which didn’t make sense. I dropped the truck off at a shop I had used in the past and they told me only they couldn’t figure it out either. At least it wasn’t just me I guess…

Eventually I purchased a second new purge valve and it worked correctly. New parts are not always good parts. Diagnostics, when dune correctly, is a science.

The Porsche experience center is great for test driving cars that aren’t sitting on dealer lots. I drove a GT4 there

I’ve done this two ways. The first was to go to a shop that a friend of a friend knows. My car is bone stock and they officially checked the car on the machine but mostly took my word for the visual inspection, plus a mirror on a stick.

The second way was to just drive it into whatever shop had tests advertised cheap. On my last smog they asked me to pop the frunk for visual inspection and were shocked to not find a motor. I opened the rear and they signed off after looking at the fans.