{"product_id":"gm-genuine-parts-ignition-knock-detonation-sensor-213-3521-oe-fit-factory-spec","title":"GM GENUINE PARTS Ignition Knock (Detonation) Sensor 213-3521 — OE Fit, Factory Spec","description":"\u003cp\u003e\u003cstrong\u003eThe GM Genuine Parts 213-3521 (12589867) ignition knock (detonation) sensor detects engine knock and supplies precise vibration signals so the vehicle control module can optimize timing and fuel delivery.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis GM Genuine Parts ignition knock sensor is an original-equipment replacement designed to match the specifications and performance of the factory unit fitted to many General Motors vehicles. It converts combustion-related vibrations into an electrical signal the engine control module (ECM) uses to detect spark knock, allowing the system to adjust ignition timing and air\/fuel mixture for smoother operation. Built to GM OE standards, the sensor aims to deliver the same fit, durability, and service life you expect from Genuine GM components.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the knock sensor affect engine performance?\u003c\/h3\u003e\n\u003cp\u003eThe sensor listens for abnormal combustion events (pinging or detonation) and relays vibration-based voltage signals to the ECM. When the ECM detects knock, it can retard timing or modify fueling to protect the engine and maintain drivability.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProduces a voltage signal proportional to combustion vibration intensity\u003c\/li\u003e\n  \u003cli\u003eEnables closed-loop ignition timing corrections\u003c\/li\u003e\n  \u003cli\u003eHelps prevent long-term engine damage from persistent knock\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose the GM Genuine Parts 213-3521 over aftermarket options?\u003c\/h3\u003e\n\u003cp\u003eThis part is manufactured to GM’s original engineering specifications for fit, form, and function, reducing the risk of mismatch or premature failure. Using a Genuine GM sensor simplifies installation and maintains factory calibration expectations for the vehicle’s engine management system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered to GM OE tolerances for reliable fitment\u003c\/li\u003e\n  \u003cli\u003eSame electrical and mechanical characteristics as the factory sensor\u003c\/li\u003e\n  \u003cli\u003eBacked by GM’s parts quality standards for durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat symptoms indicate a failing knock sensor?\u003c\/h3\u003e\n\u003cp\u003eA deteriorating sensor can trigger diagnostic trouble codes, reduce fuel efficiency, or cause rough idle and hesitation due to incorrect timing adjustments. In many vehicles the check engine light will illuminate when the ECM identifies inconsistent or absent knock signals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIlluminated check engine light with knock-related codes\u003c\/li\u003e\n  \u003cli\u003eReduced fuel economy or increased emissions\u003c\/li\u003e\n  \u003cli\u003eEngine hesitation, rough idle, or loss of power under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to replace and what should installers know?\u003c\/h3\u003e\n\u003cp\u003eReplacement is typically straightforward for someone familiar with basic engine work, though access may vary by vehicle model and engine layout. Always follow vehicle-specific service procedures and torque specifications to ensure the sensor seals and connects correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for direct fit on compatible GM applications\u003c\/li\u003e\n  \u003cli\u003eRequires proper connector seating and specified torque on mounting hardware\u003c\/li\u003e\n  \u003cli\u003eCheck wiring and harness condition before installation to avoid false readings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this part for: The GM Genuine Parts 213-3521 (12589867) ignition knock sensor is intended for GM owners and technicians who prefer original-equipment components to maintain factory performance and reliability. It's the right choice for routine replacement, repair shops restoring OE functionality, or anyone troubleshooting knock-related diagnostic codes on compatible GM vehicles. If you want a direct-fit sensor made to factory specifications that integrates with your vehicle’s engine control strategy, this Genuine GM sensor is engineered for that purpose.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this sensor fit my GM vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check your vehicle’s year, make, model, and part number compatibility; 213-3521 (12589867) fits specified GM applications listed by VIN lookup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does replacing the sensor clear the check engine light?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Replacing the sensor may clear knock-related codes, but you should erase codes with a scanner and verify the issue is resolved.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48079806726302,"sku":"B000K02EDG","price":85.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gm-genuine-parts-knock-sensor-front-view.jpg?v=1785771239","url":"https:\/\/northtrailauto.ca\/products\/gm-genuine-parts-ignition-knock-detonation-sensor-213-3521-oe-fit-factory-spec","provider":"North Trail Auto","version":"1.0","type":"link"}