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On both cars the knock sensor is located in the intake valley.
the computer receive signals if engine knocking and adjust the timing till stop.Before replace the sensors make sure the engine have no other misfire ,bad gas or vacuum leak.plug scan tool and read the code.Only circuit problem will be a true knock problem. Inspect all wire connectors before start taking a part.
It is somewhat complicated to change the knock sensors. There are two of them and they are located under the intake manifold. The intake manifold must be removed. I would recommend tha you replace both while you have the engine apart.
What leads you to believe the knock sensors are bad, I've seen few bad knock sensors? The knock sensor issues more times than not have been caused by other problems.
After you remove the intake manifold disconnect the knock sensor connectors. Remove the bolts and the two knock sensors then replace with new knock sensors tighten the bolts to 15 foot pounds. Reinstall manifold. The total job for an experienced mechanic with tools is about 5 hours. Not a good job for a beginner.
Thanks for the info its very important, the knock sensor is located top of the motor under the intake, i know iys a bad spot for it, make sure to get a delphi or dealer sensor, ive try them all and ended up doing the job twice so ive learned you get what you pay for, i would get the sensor from the dealer and the gaskets you can get from any parts store hope this helps, i've also included a diagram that show sensor to help you locate any others and it shows some what where the knock sensor is, good luck,
Under the intake manifold. Make sure you get the harness for the knock sensors. and clean out all of the rust and junk you're going to find donw in the holes before and after you replace the sensors.
You can replace them, I assume they are very expensive, I did a toyota avalon once, since it was a V6 it sits in that V6 valley. It was hell trying to get to. The parts was very expensive for a pair of piezo crystals, which is what a knock sensor is. They are almost like those little piezo element for tweeters that you can buy for 5 bucks. LOL
oil pump is in the oil pan and if you have no or low oil pressure replace pump before doing anything with knock sensor. knock sensor is more or less a microphone and listens for spark knock but will set codes for any knocking or tapping noise which is commonly heard if oil pump is malfunctioning
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