Now Getting P420 and P466 Check Engine Lights

TL;DR - I've started seeing P0420 and P0466 check engine lights (CELs) as often as once a day on trips.

Easy to clear but still annoying.

I've been getting a P0420 check engine light (CEL) every now and then for about the last three years. It's been infrequent enough that I've mostly just cleared it using my Kiwi 3 OBDII Bluetooth Adapter (here's a cheaper alternative) and kept on with my day.

However, in the last six months, it's started to become more frequent, and in the last three months I've also begun to get a P0466 - EVAP Purge Flow Sensor Circuit Range/Performance - every now and then, perhaps related to the strange clicking that I heard coming from the gas tank area, which I blamed on Fred the Marmot - when we were in the Canadian Koots.

Now that I'm getting these more regularly, I'm going to look into whether there are easy solutions. Cleaning the MAF, perhaps a new rear O2 sensor, maybe a EVAP purge valve if they aren't too pricey. I'm not planning to go as far as a new Catalytic converter - if it comes to that - though.

Easy to clear but still annoying.