Got this info from Mike:
Thanks for contacting us. Your Polestar 2 will be covered for all manufacturing or material defects for the first 4 year/50,000 miles (whichever comes first). The battery and electric motors are also covered for 8 years or 100,000 miles (10 years or 150,000 miles in California). Polestar 2 will also have extended warranty protection against corrosion for a period of 12 years and airbag / SRS system coverage for a term of 5 years.