🛎️ AC DELCO 213-3521 Knock Sensor Pair: Quality for Chevy GMC Cadillac Pontiac Pickup V8 Review

I was trying to find the cheapest knock sensors for my 2006 Silverado with 5.3. After receiving 2 kits that didn't work, I decided to go with genuine AC Delco parts. Installed and works as it should. I highly recommend just getting them for your Chevrolet LS and not wasting your time on the cheap ones.

I ordered two knock sensors to replace the stock sensor when I replaced the valley seal. I didn't have any faults before but I need to replace the old ones as they are rusty anyway. After the valley and collector seals were installed, I drove to my summer home. A few miles later the check engine light came on. I check with my code reader, it was knock sensor 2 reading low voltage. I had to redo everything I had just finished with work. Bought a Dorman knock sensor to replace a broken one…

Knock Sensors are 100% OEM and come with the new blue GM logo. The new branding/packaging is designed to help the end user identify their OEM. Each unit is wrapped in bubble wrap and placed in a plastic sleeve. It's easy to identify genuine OEM, not old parts sitting on the shelf. The cost is higher, but once you've removed the intake manifold you'll be glad to have better replacement parts so you don't have to do it twice. More than one how-to video on YouTube has talked about swapping knock…