Re: sparks plug and knok sensor wj overland
Plugs should not have caused this fault message. The code means that Knock Sensor #1 Circuit Knock sensor signal above or below minimum acceptable threshold voltage. This means an open circuit, short circuit or a bad sensor. Since it only appears on tough roads, i would start checking the wiring and connectors, especially if there is not a wire shaved through and making contact with a metal part.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks /
Pirelli Scorpion ATR 245/65/17/
Transgo reprogramming shiftkit.