knock sensor

[quote:4afa4b958b="frizzle1"]I have a 2000 kia sephia w/ 1.8L 4cyl. auto trans. w/ 52000 miles I recently changed my knock sensor which was bad now i am getting an code for the knock sensor that said knock sensor range/performance problem it lost a lot of power and above 4000 RPM the engine knocks kia wants me to bring it in and won't even give me a hint to what it maybe HELP anyone[/quote:4afa4b958b] Have you torqued the knock sensor bolt to the correct tightness? On the Kia's a knock sensor code is usually stored when the hydraulic valve lifters / tappets are noisy and this is transfered through the block to the sensor.The origional fault is probably poor engine oil or faulty hydraulic lifters.