I have a 2007 Sub with only 74 miles. Check engine light turned on with OBD code P0446 (Evaporative Emission System Vent Control Circuit 1/1. I've replaced the gas cap, vapor vent canister valve, vapor jumper wire and the Emissions Vapor Canister Purge Valve Solenoid EVAP Vent ( I don't think it's necessary but I did it anyway). Cleared it and the check engine light is gone but after driving 93 miles, the I/M is still not ready with a combo drive of city and fwy. Drove it for another mile and after 6 cycles, when I ran the OBD at 94 miles to see if it's I/M ready, unfortunately I see the same "pending" P0446 code despite driving it up to 110 miles hoping it will clear on it's own. So I decided to erase the pending code/OBD and did the same thing again. Drove it up to 92 miles without check engine, still not I/M ready and at 94 miles later it's still not ready and the "pending" p0446 code is back. I'd appreciate any suggestions on what to do so I can get this smog. Btw, I/M reads as: PdDTC (1), Evap (X), Cat (X) and the rest has a check mark/ready.
I saw this video a while back. I was hoping that's not the part that I have to replace cause it's gonna be a pain to replace it without a lift and I also hesitated cause his burban is an older year too. I guess now I will have to cause it's the only part that I haven't replace. Much appreciated toyotagrl!
I have a 2007 Sub with only 74 miles
a 15 year old vehicle with 74 miles?
That's brand new.
I know right! From experience, if the car is not started at least every two weeks, you'll have more electronic issue as they age.
The mileage cannot be right. 15 years old? More like 174,000 miles.
He did give us a vital clue 
True! That would explain the lack of road use.
Sometimes, the reset takes a couple of hundred miles driving.
Thanks Doc! I'll continue to drive it and hope the pending code will go away and fix itself . 🙂