Upgrade your 01-99 Chevy & GMC with the NTK Oxygen Sensor, model number 21510. NGK, a trusted name in automotive parts, ensures reliability and precision in this essential component. The sensor is designed to meet manufacturer specifications for a seamless fit and function. Enjoy peace of mind with the included 1-year warranty, offering coverage against defects and failures. Be aware of the California Prop 65 warning that accompanies this product. This oxygen sensor is a fundamental part of your vehicle's emission system, designed to provide accurate readings for optimal performance.