What is the problem with my knock sensor?
3 weeks ago my check engine light came on during a long drive. I had AutoZone run a test and they recommended I replace my knock sensor, so I did. The light went off while I was waiting for it to be mailed, but I replaced it anyway just to be safe. Now the light came on again and AutoZone told me the same thing. The car's running fine, but the check engine light hasn't gone off this time and it's been a few days. I'm not sure what to do.