Made an appointment for the latest EVAP code.
This time a P0440 after 350 miles of trouble free driving.
Equally anoying, almost a year later and the aux battery in the Prius just died.
So I'm re-charging it now hoping it will hold a charge.
This is the second occurrence (this time last year, same thing, possibly related to cold weather?).
It's 11 years old,, so probably way past due time for new aux battery.
I'd hate to get stuck somewhere with a dead aux battery.
Local Toyota Parts Department quoted a replacement cost of $195.99 + $18.0 core = $236.85.
Local Toyota Service Department quoted $390+ to replace the battery with a new one they have in stock.
Will do the install myself if the old battery holds a charge.
It's a 7-1/2 minute job.
Thanks.