Review on 🔥 213-3521 ACDelco GM Original Equipment Ignition Knock (Detonation) Sensor by Pedro Hague

Inexpensive if they work for you. Before installing both of these knock sensors, I had a knock sensor code. After installing these two brand new ACDelco knock sensors, I had to split the knock sensor codes. And yes the wiring harness was replaced with a new one, after researching I decided that those knock sensors just sucked. Now back to removing the air intake, which was a breeze the second time around. But those two knock sensors don't spin freely. They were only tightened to 15 foot pounds. Somehow I managed to get one out. But the second one kept spinning and I found it was completely broken, probably because I was trying to unscrew it. As can be seen in the photos, I had to remove the Valley pan lid in order to use pliers on the broken knock sensor threads. And even then, it took a lot of effort to break off the broken part. Not sure if these are fake knock sensors they are showing online. They have a resistor inside to read the correct voltage but they don't have the other internals they need to create AC voltage to send to your PCM so you don't get a knock sensor check engine light. Luckily I started this project first thing in the morning. They only broke when I tried to pull them out to return them for those who want to know what I used instead. I went to Napa Auto Parts and bought a brand name knock sensor from there and they work great. Knock sensor Check that the engine lights are on.