Search  for anything...
ACDelco

ACDelco GM Original Equipment 213-3521 Ignition Knock (Detonation) Sensor

    • Based on 2,150 reviews
Condition: New
Checking for product changes
$40.03 Why this price?

Buy Now, Pay Later

As low as $10 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: 12 left in stock
Fulfilled by Amazon
Arrives within 30 days
Order within 22 hours and 11 minutes
Available payment plans shown during checkout

Features

  • GM recommended replacement part for your GM vehicles original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function

Description

An ACDelco GM Original Equipment Ignition Knock (Detonation) Sensor monitors the engine for pinging or spark knock, and is a GM-recommended replacement for your vehicle’s original component. The sensor creates a voltage signal based on the vibrations caused by erratic air/fuel mixture combustion; the engine control module uses this signal to adjust the ignition timing and air/fuel mixture. This original equipment ignition knock sensor has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.


Brand: ACDelco


Item Dimensions LxWxH: 2.7 x 2.7 x 2.3 inches


Item Weight: 0.18 Pounds


Style: Modern


Mounting Type: Flange Mount


Manufacturer: ‎ACDelco


Brand: ‎ACDelco


Model: ‎GM Original Equipment


Item Weight: ‎2.88 ounces


Product Dimensions: ‎2.7 x 2.7 x 2.3 inches


Country of Origin: ‎Mexico


Item model number: ‎213-3521


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Chrome


Manufacturer Part Number: ‎213-3521


OEM Part Number: ‎12589867


Date First Available: September 20, 2007


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: within 30 days

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Klarna Pay in 4
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • IMPORTANT!! Test your sensors before installing!!!
2005 Silverado 2500HD 6.0. 170k miles. Ordered 2 AC Delco knock sensors. The rear engine mount hole was full of water and rust as was expected. Installed them to spec. Still had the CEL for Low input bank 2 (rear sensor). Pulled everything back apart and installed 2 Delphi sensors. No more codes. 1 AC Delco sensor was delivered with the box open and the bag was open so maybe it was a return that made it through or it got damaged in shipping. Watch a few YouTube videos on the process of changing knock sensors. *Remove the rear piece of foam from the intake manifold. Throw away. *Check and clean 2 grounds at the rear of the engine while the manifold is off. *Clean the gunk out of each knock sensor hole. *Make little horseshoes of silicone with an opening facing the rear of the engine around each sensor port to direct water away. Horshoes, not circles. *Replace the wire harness. $22. *Add silicone to new rubber harness boots when installing. *Torque knock sensors to 15ftlb. *Torque manifold mounting bolts in a criss cross pattern starting in the center to 44inch pounds and then 2nd pass with 88inch pounds. *Can replace the manifold gasket as well. $40-55. ... show more
Reviewed in the United States on July 15, 2023 by Scott
    • Knock Sensor
Works like it should.
Reviewed in the United States on August 15, 2023 by Howard Renner
    • Great Product, no codes!
Review Image by GmcSierra15005.3 GmcSierra15005.3
Review Image by GmcSierra15005.3 GmcSierra15005.3
Review Image by GmcSierra15005.3 GmcSierra15005.3
I had to rework my heads, while I was at it these knock sensors had been an issue for a while. Its a nasty mess down in the knock sensor holes, apparently moisture is an issue. I cleaned the area and installed these knock sensors, the hard part was deciding based on the reviews which sensors to go with. These are OEM, good quality, and have not given any trouble. It helps to thoroughly clean the ports, install new seals, teflon tape the threads, assure the harness and connections are properly routed and well connected. I have found no issue with this product and am well satisfied. ... show more
Reviewed in the United States on June 8, 2023 by GmcSierra15005.3 GmcSierra15005.3
    • These work!!
Review Image by James James
I had some aftermarket ones from autozone that threw a knock sensor code despite being new. I ordered these, installed them and the code cleared itself in about 3 minutes. Code hasn't come back.
Reviewed in the United States on July 9, 2023 by James James
    • SES light!
Changed out my originals( 20yrs old ) while doing maintenance, however after driving it keep getting low signal error code on aft sensor. Not knocking but bad signal or erroneous issue. Have to remove the intake AGAIN to remedy.
Reviewed in the United States on July 2, 2023 by Brian Diehl
    • Great OEM knock sensor at half the price of the local auto stores.
Review Image by Honest Reviewer Honest Reviewer
Review Image by Honest Reviewer Honest Reviewer
Review Image by Honest Reviewer Honest Reviewer
These knock sensors were a direct fit for my 2001 5.3L Chevy Silverado. They were shipped loosely bagged inside the amazon box with some air pillows but arrived undamaged. This is an area of concern that has been discussed however the parts arrived undamaged. One thing to note is that although this is an OEM part, the product is assembled and made in mexico. Upon installation however that did not seem to matter as the sensor performed as it should. These same sensors cost twice as much at the local auto parts store. Amazon had the best value with it being just slightly over another websites price but having two day shipping with prime. The knock sensor performed flawlessly at first start up and its been a week now with no problems. No more CEL :) Some things to note if you are performing the knock sensor job on a GM: Make sure you have an open weekend to perform this job, It will take upwards of 6-8 hours. As noted below, since the manifold will be off, now will be an excellent time to replace optional parts. You might also want to do additional maintenance such as cleaning the IAC, MAF and throttle body. Parts you will need: 2 Knock sensors (usually only the rear gets damaged but since this is a large job you might as well swap them both) 1 Knock sensor harness (The old one will be useless. The boot wont seal tight and the connectors will be brittle and likely break) 1 Intake manifold gasket (This is a given. You do not want to do this and have a vacuum leak after putting it all back together) 1 Throttle body to intake manifold gasket (You will problably unmount the throttle body for easier removal and cleaning) 1 RTV tube (High temp is preferred. This is used to create a dam and keep water from entering the knock sensor and corroding it) Miscellaneous Optional: 1 Bottle of Throttle Body Cleaner (While the whole manifold is off you may take this time to clean the throttle body thoroughly. 1 bottle of MAF cleaner (To clean the Mass Air Flow sensor and Idle Air Control Valve) Some Shop Towels: (You will be doing alot of cleaning of parts caked with grease/dirt/grime) Shop Vac: (No matter how careful you are chances are leaves or debris will fall into the cavities of the valves/knock sensor while removing the manifold. A shop vac makes quick haste of cleaning all this debris) Other parts to consider replacing while you have the manifold off: Valve cover gaskets w/grommets (This is a perfect time to replace the valve cover gaskets if you notice any small oil leaks) Heater Hose Quick Connectors: (These things are also notorious for breaking in alot of GM trucks near the firewall. If you have never replaced them, now would be a good time to replace them since you will have easy access to them) Note: I did not include any part #'s as they will vary per vehicle application. ... show more
Reviewed in the United States on September 17, 2016 by Honest Reviewer Honest Reviewer
    • Easy install if you have any idea how to approach it.
This review is more to respond to the other reviews I have read about this. This repair is a money maker for GM dealers. It is super easy in comparison to how intimidating the job is. I read some review that said it should take a whole day. It is a 2 hour job unless you take a nap mid way through. Also, the gasket on the intake is completely reusable silicone which clips on the completely plastic intake manifold. DON'T BUY THE GASKET. There is a reason why the stupid gasket is almost $100, it's because it is high quality and reusable. The harness is also probably fine. I should also mention that I am not a super cheap person who would waste tons of time to save a couple bucks. Some of the reviews I read were just ridiculous. To perform this task you just need to peel all the wires and hoses off the intake and zip tie them up to the wiper blade, and pull the intake out from underneath. The gasket is clipped on to the plastic intake. Vacuum out the crap that is in the valley, clean it up, swap the knock sensors and slide the intake back on. The screws on the intake are delightfully captive to the assembly making re-assembly easy. Also to note is how the screw (little M6 things) have plastic boots where they go through the intake. These are also gasket surfaces, as they pass through the intake inside of the base gasket, but for some reason the reusable gasket reflexive replacing people seem to not identify this. Just because it is a gasket doesn't mean you have to replace it. Save the money, buy both sensors (even if you only need one) and nothing else. Have a shop vac on hand and a can of brake cleaner to clean up the gasket surfaces. Once you complete this job, doing it again is super easy should you ever have to. ... show more
Reviewed in the United States on June 17, 2019 by M

Can't find a product?

Find it on Amazon first, then paste the link below.