Hi my check engine light is on and an OBD scanner shows Knock sensor 1 Low signal. According to my manual KS1 is on the front bank of cylinders. I replaced this last night. Cleared the OBD error, took the car for for a spin and the check engine light is back on with KS1 Low signal! I'm thinking either KS1 is on the rear bank of cylinders or I have a wiring problem. I bought 2 sensors so I'll replace the other one this weekend. It could be a wiring fault as I got a complete engine replaced under warranty last year, maybe something got stretched in the process. Just wondering if anyone else has had fun with knock sensors?? Thanks. Car is a G6 GTP 3.9L.