Thought I'd share my experience with a P0433 DTC that caused my check engine light to illuminate. This is a CIRCUIT PROBLEM code so I'm immediately thinking wiring problem. Ugh. Car has always been garaged and only has 10,500 miles on it - so I was thinking possibly a rodent (mouse) chewed something. We definitely had mice in our last home's garage.

Carefully inspected the harness and loom as best as possible end to end with a good light. Everything looked intact...

P0433 - evap purge valve circuit problem - no cost repair & lessons learned