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Anonymous Posted on Apr 05, 2018

I have a 1998 lexus 300 that a friend of mine just replaced both knock sensors. Thecarwas just retested and the trouble codes came back on for the knock sensors. What do I do now?

The wiring harness was replaced and the codes were cleared after

5 Related Answers

Anonymous

  • 133 Answers
  • Posted on Jan 07, 2009

SOURCE: Where is the Knock Sensor located on a 1994 Lexus ES300

  1. located on top of engine below intake manifoldgraphic.aspx?mod=reptiff&module_id=1&session_id=%7ba7aa889f-b7e3-42e1-9ece-3476a2533f69%7d&image_guid=95d24086&print_bw=0&

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Dan B

  • 36 Answers
  • Posted on Mar 16, 2009

SOURCE: 92 lexus es300 knock sensor

Need to remove the upper and lower air intake manifold.  There are two knock sensors for the front and rear pistons banks.  If you plan to do this yourself it is about 1 to 2 hours.  While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it.  Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300.  Pretty easy.
DIYr

Anonymous

  • 5158 Answers
  • Posted on Apr 15, 2009

SOURCE: How many O2 sensors on a 1997 Lexus ES 300?

according to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.

Anonymous

  • 253 Answers
  • Posted on May 06, 2009

SOURCE: bad knock sensor on 1998 chevy malibu 2.4L

The knock sensor is on the back side of the engine near the trans. It is round, with a 1 wire connector. You will have to get it from underneath. Good Luck.

mcheesm

  • 25 Answers
  • Posted on Jul 14, 2009

SOURCE: High RPMs

yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,

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I recently bought a 2000 lexus rx 300> check engine light came on and i was locked out of overdrive< knock sensors and wiring harness with oxygen sensor replaced for !000. now check engine...

I had the same problem with my RX. Had both knock sensors replaced and the problem went away. Be sure to take it to a Tech that has a good scan tool so he can pull the codes and narrow down the problem, From what I understand a constant check engine light is usually not a big deal probably a sensor but a blinking light means major trouble. Take it to a shop that specializes in Toyota and Lexus.
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they will be on both side of the engine block and they thread in clockwise.
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I'm not a lexus guy , but I'm thinking that you have a vacuum leak somewhere.
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Has anyone ever replaced knock sensors on 98 lexus es300

yes, I have they are located between the 2 banks of the motor. you need to remove the upper intake manifold to get to them. not hard to do. Also its a good idea to replace the mini harness with them.
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92 lexus es300 knock sensor

Need to remove the upper and lower air intake manifold.  There are two knock sensors for the front and rear pistons banks.  If you plan to do this yourself it is about 1 to 2 hours.  While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it.  Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300.  Pretty easy.
DIYr
4helpful
1answer

High RPMs

yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,
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Knock sensor

knock sensors are underneath the lower intake. replace the knock sensor harness as well
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