Holstein Knock Sensors are direct OE replacements for these critical engine components, offering perfect fit, form and function for flawless operation that protects your engine from damaging detonation and pinging in all types of driving conditions. Precision engineered sensor exactly duplicates the function of the OE component, providing critical information to the vehicles ECU so it can adjust engine timing to prevent internal engine damage when detonation occurs. Manufactured with premium materials that ensure rugged, long-term performance and the heat resistance necessary to withstand high engine operating temperatures. Exact OE connectors and attachment points ensure a trouble-free installation process. Fully tested to ensure voltage matches OE specifications. Backed by Holsteins 3 year/36k mile warranty - we believe in our parts and our warranty shows it! Arrives packaged in a Zip-Loc style anti-static bag that protects the electronic circuitry and components. The Holstein brand represents a blend of advanced technological innovation and exacting European craftsmanship that stretches back over half a century. This tradition of precision engineering, rigid standards, and optimum performance guides us as we continually strive to enhance our offerings and adapt to continuing challenges in the marketplace. Holstein parts are built to meet OEM specs for form, fit, and function, and provide an outstanding value at any level. Holstein - Parts that perform. Service that delivers.