Engine doesn't want to shut off sometimes

Ive noticed the same thing in my V. I noticed it idles around 12xx. I have a gauges on my stereo. I feel a slight delay one second during acceleration before it kicks in. I'll shut the car off and it will act normal after that. A buddy let me borrow the DrPrius app. I ran a few battery check ups on a few prius I own. I run three amplifiers just above spare tire compartment. They run hot. But I found something else....

 

Techstream can run a "health check" on the hybrid battery, IIRC. That said, Dr Prius is worthwhile, and cheaper. Works with the Carista dongle. Just doing the static test (battery monitor) is all I've done, easy, and provides some insight. There's a couple of active tests you can do, with the car running, as well.

 

The dealer is right, it won't code until it gets worse but it's not long now. I would look for an independent hybrid shop while you are still not under the gun.

To get a go no go guess from Dr Prius you have to pay extra to those guys who also happen to be selling poorly designed aftermarket hybrid batteries.

You want new oem (for less money at some independents) or a mix and match used oem battery if long life is not a concern.

Techstream really has no active tests for capacity or battery health. However it is certain your battery is failing. On rare occasions an independent shop could improve your battery if corrosion or one or two weak modules were the immediate issue. A dealer would never do that kind of short term repair.

Its your call.