How do you replace the knock sensor in a 2003 Toyota carolla?

Answer 1

Should be on the side of the engine block with one bolt and wire harness. Make sure you really need this as they are not cheap! Make sure your fuel is good your sparkplugs are in good shape, (iridium ngk). Make sure your timing is correct. If all of this is correct and you are still getting a knock sensor code then you may need to replace it. Note: they do not usually go bad. The cause of the code problem is usually not the knock sensor itself, but the signal wire between the knock sensor and the external connector by the intake manifold. This wire gets brittle if it is overheated. Removing the connector during disassembly can break the signal wire inside the shield. Obviously, that prevents the signal from getting to the PCM. We advise techs to replace this short length of knock sensor lead wire any time the intake manifold is removed. Especially if it’s been overheated. A quality Knock Sensor is more important than ever thanks to todays increasing gas prices. Your Engine Knock Sensor enables your vehicle to obtain the optimum combination of timing and fuel/air mixture to generate power and efficiency and that means less wasted gas. In addition to robbing you of fuel economy and performance a faulty Knock Sensor can cause expensive damage to your engine. Remember, the Knock Sensor keeps fuel from detonating in the cylinder, exploding rather than quickly burning as it should. If not replaced a faulty Knock Sensor can quite literally cause hundreds if not thousands of dollars in damage.