2002 Toyota 4Runner Toyota 4Runner - Check Engine Light

2002 Toyota 4Runner Four Wheel Drive Automatic 40000 miles

Hello,

About a week ago, my car (2002 Toyota 4Runner) started to display a check engine light, along with the VSC light (vehicle stability control).

I checked the user's manual, which said it was still safe to drive with the VSC light, so I waited until the following weekend to take the car into the shop. About 3 days later, the light turned itself off, but I still took it to the shop, to be safe.

The mechanic has told me that the error code says the Charcoal Canister and the Vacuum Pressure Valve must be replaced, for a cost of $800.

First, does this sound like a fair price? Should I take the car for a second opinion?

I realize that there is not enough background info to answer this next question, but this is literally all I know. But anyways, is this a necessary repair?

Thanks in Advance,

Sae