There is a one year warranty on all of our products. This does not cover physical damage. This only covers if the product is defective. Warranty shipping is only valid in the Contiguous United States. For defective products, GlowShift will cover all shipping charges to and from you within 30 days of the delivery date. After 30 days, you are responsible for sending defective products back to us and GlowShift will pay for the return shipping cost. The included Bosch O2 Sensor includes Bosch’s 30 day manufacturer’s warranty. GlowShift does not warranty this O2 sensor after that 30 day time frame.