



⚡ Keep your GM engine running smooth and knock-free — because every millisecond counts!
The ACDelco GM Original Equipment 213-3521 Ignition Knock Sensor is a GM-recommended, precision-engineered component designed to detect engine knock and send real-time signals to the ECM. Manufactured to exact GM OE specifications, it ensures optimal ignition timing, prevents engine damage from pre-ignition, and guarantees reliable, durable performance for your GM vehicle.





| Manufacturer | ACDelco |
| Brand | GM GENUINE PARTS |
| Model | GM Original Equipment |
| Product Dimensions | 6.86 x 6.86 x 5.84 cm; 81.65 g |
| Item model number | 213-3521 |
| Exterior | Chrome |
| Manufacturer Part Number | 213-3521 |
| OEM Part Number | 12589867 |
| Item Weight | 81.6 g |
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