GM Genuine Parts 213-3521 Ignition Knock Sensor (Detonation Sensor) – OE Replacement

Overview

GM Genuine Parts 213-3521 Ignition Knock Sensor is a GM Original Equipment part designed to monitor engine pinging or spark knock. When detonation is detected, the sensor sends a signal to the engine control module, helping it adjust timing for efficient combustion while maintaining performance and reliability.

These sensors generate a voltage signal derived from engine vibrations caused by irregular air/fuel combustion. The engine control module uses that signal to fine‑tune ignition timing and the air‑fuel mixture in real time, aiding consistent operation across driving conditions.

Why choose GM OE Ignition Knock Sensor

• Direct replacement for your GM vehicle's original component, ensuring a seamless fit
• Quality, reliability, and durability expected from GM OE
• Manufactured to GM OE specifications for correct fit, form, and function
• GM-recommended replacement part for your GM vehicle’s factory sensor

Real-world driving scenarios

In daily use—from bustling city streets to open highway cruising—the sensor helps the vehicle's computer respond to changing conditions. Timely timing adjustments can contribute to smoother idle, responsive acceleration, and steady performance across varying speeds.

Designed to work within GM’s OE ecosystem, this sensor complements the vehicle’s original components, supporting long-term reliability and consistent engine management.

How it works

The sensor detects vibrations associated with detonation and converts them into a small voltage signal. The ECU uses this data to refine ignition timing and air‑fuel ratio, supporting stable engine management under different loads and driving scenarios.

Installation and quality

As a GM OE part, it is built for a straightforward fit on compatible GM vehicles without modification. Proper installation helps preserve intended performance and the expected service life of OE components.

Quality you can rely on

GM Genuine Parts carry the engineering standards that power GM vehicles. This ignition knock sensor is designed to endure typical engine environments and maintain durability when installed as part of routine maintenance.