Question about 1999 Lexus RX 300

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1999 rx 300 3.0 knock sensor how do i replace a knock sensor?

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Remove intake manifold and air intake chamber completely, the knock sensors are located in middle of engine

Posted on Sep 07, 2010


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1999 Lexus rx300. New knock sensors, harness,etc. when I start it,it knocks ,has no power,very sluggish.

Check the pressure in the fuel pump
Check the fuel filter for dirt
When there is weak fuel pressure, it generates this type of failure
Also check the compression on the engine cylinders

Apr 30, 2017 | 1999 Lexus RX 300

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99lexus rx 300! Replaced 2 knock sensors and harness,2 cats,tranny flush, bosch platinum plugs, not iridium!! 11.2 litres Hwy,14.2 city Full tank of gas at $1.08 litre, 341k,not good ! Any insight!!

run the fault codes to determine if there are any sensors operating out of set parameters
your indications are that the HO2S sensors are not operating correctly or cannot set the ECM for the air/fuel ratio
could be a problem MAP/Baro sensor, faulty injectors (spraying and not atomizing), low fuel pressure or simply at 17 years old or a guestimate Klm of around 340,000 klms the motor is a bit tired
anyway run the fault codes first and then having a wet and dry compression test ( a qualified service mechanic will know what I mean) done will determine the engine condition

Feb 01, 2017 | 1999 Lexus RX 300

1 Answer

I recently changed both knock sensors and wiring harness on my 99 Lexus rx 300! I purchased the parts on ebay and they state (OEM PARTS) Check engine, P0330,

code p 0330 refers to knock sensor (KS)2 bank 2 ---circuit malfunction===causes wiring--KS---ECM
it is possible that in changing the harness there is a problem connection or the connection to ks2 is not correct ( not on properly)

Oct 01, 2016 | 1999 Lexus RX 300

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Would the knock sensor on a 99 Lexus 300 cause the transmission to not shift out properly?

Yes. Thanks to Dennis Weid, Robert Garcia, Colin Strickland, and "gingo12670" on this website, that is what I found to be the problem causing my 2000 ES300 to not shift more than once into overdrive without shutting my car off. Apparently if your knock-sensor(s) is bad it will send a signal (or lack of an expected signal) that will cause one of the "brains" to not allow a shift into overdrive since that would only aggravate a knock situation. The sensors are not an easy fix as the intake manifold must be removed. It cost me $750, but I am happy as a clam since the solution has eluded me for too long. My Lexus has over 200K miles but after flushing my transmission to no avail, but just now replacing both knock sensors, it now feels once again like a new car.

Jul 21, 2014 | 1999 Lexus RX 300

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Code p0330 knock sensor does this affect the way it shifts if engine light is on

Possible but unlikely. Code p0330 refers to knock sensor(KS) 2 bank 2-circuit malfunction==causes --wiring --KS--ECM. Replace the KS. The engine light is telling you that there is a problem with sensors in the ECM and that is what will be affecting the performance . Shifting is the area of the TCM( transmission control module ) so have that checked out as well

Oct 26, 2013 | 1999 Lexus RX 300

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Not shifting into overdrive and check engine light

I'm not a lexus guy , but I'm thinking that you have a vacuum leak somewhere.

Nov 06, 2009 | 1999 Lexus RX 300

1 Answer

Where are knock sensors in my 99 Lexus RX 300 ?

Hello there..They are in the back of the engine block about in the middle of the motor..There might be one in the front of the engine in the middle of the block but most are in back.Hope this helps you and have a great day..

Apr 02, 2009 | 1999 Lexus RX 300

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My lex

knock sensor needs replace

Nov 08, 2008 | 1999 Lexus RX 300

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