I bought this EK with a CEL, and diagnosed that it was a P0325, so I changed the knock sensor in it and it was okay....for 2 months/6000kms. Then the CEL came on again, so I went to check it....P0325, Pre detonation...although it did just cross over into winter...So, I took the plugs out and they were pretty done, I replaced those and put in 91 octane gas to help compensate for the denser air. It worked for about two hours but then the light came on again. I don't notice any pinging or knocking but I'm ready to throw this car in the trash Any suggestions for clearing this CEL? It shouldn't have burned through another knock sensor should it?