Information

We guarantee your satisfaction or the improved performance in your vehicle when you use Bosch Iridium Spark Plugs. If you are not satisfied or do not experience quicker starts and smoother acceleration, return the plugs with your dated sales receipt and Bosch will refund the purchase price of the spark plugs.

This guarantee applies to properly tuned vehicles and extends for seven years, or for the manufacturer's recommended spark plug change interval as indicated in the owner's manual.
Industry-leading technology backed by an industry-leading warranty; Bosch pays labor for up to 12 months after installation. Any claims will be forwarded to the Spark Plug Engineering team for follow-up and analysis. See full warranty disclosure for details.

To obtain performance of this limited warranty, the shop must submit a warranty claim to Bosch's TSS Department within 30 days after discovery of the damage or product failure.