Was this added as a primary or secondary drive? Did you install it directly or format it externally? If booting from your original drive use Disk Utilities and format the drive GUID before trying to use.
The 4sns/1/4000000 TH00-900 is a hard drive temperature sensor. Looks like the original hard drive has been changed without addressing the possible Apple priority firmware issue. lease tell us what the main hard drive is, make and model number and if it has an Apple logo on it. Your fan is probably running at high speed too. I'd like you to check your exact machine by entering the serial number here and let me know:
Next you need to get a cheap external enclosure or a universal adapter to address the SSD externally. Please tell us exactly what it is.