lexjer

I want ot change the knock sensor in my lexus ls400 97 they are right in the midle of the blocks,I was checking them out today, and I nocited one of them in the right side does not have any cable conected. is that normal? my check engine came on and the code machine is showing knock sensor the thing is with one i have to change since there are two and one doesn't have any cable conected to it.

thanks for your help in advance:

curepunx

iTrader: (3)

I'm not sure if the knock-sensor issue applies the same for 1LS and 2LS, but usually the issue is due to bad knock sensors. The wiring is generally fine (as long as you dont pull on it roughly). Replace BOTH sensors while you're doing the work and make sure they're plugged in correctly. After that, reset the ECU and your CEL should'nt appear anymore.

Goodluck!

lexjer

just took the car to the local shop for a second opinion, and they found out the wire got eaten by a mice/rat
still very hard to get to those wires though I think I'm gonna have to pay the local shop $250 lavor plus parts... I guess is not too bad.
unless I do the work but i,m not a mecanic

curepunx

iTrader: (3)

If it's just the wires that are worn/disconnected and NOT the actual connector, then you can have them remove the intake manifold to get access to the knock sensors. After that, they can re-wire the existing cables to the connector and reset the ECU.

Labor can vary but its easily a 3-4 hour job to remove and re-install. I paid about the same at my local shop (labor only) to have the work done. Goodluck!

DeezyLF

i went to a shop 2day and the mechanic said Knock sensors people dont really need... i damage the left 1 on my 98 gs400... he said there is a Resistor that u can hook up . does anyone know the wattage or range the resistor is??? pm me please

PureDrifter

iTrader: (10)

that sounds like a stupid mechanic and a ghetto fix.
knock sensors are important in keeping the engine from detonating, and are especially important if you run crappy fuel and/or live in overly hot climates, or ANY OTHER TIME the engine is being run properly.

python

iTrader: (4)

LMFAO! replace the sensors,connectors and the starter since u r in there! take it elsewhere,ur mechanic is a retard...dont need knock sensors?! wow!

steve2006

Perhaps the "mechanic" should have knock sensors fitted to his head to detect brain activity,but there again they wouldn't find any.

RA40

iTrader: (6)

Get it done right. This may be a potential problem with the emissions system and if it fails to pass smog, you'll wind up having to fix it anyhow.

It doesn't cease to amaze me what rats and mice will chew on.

turboomni

Knock sensors are there to SAVE you motor,,I will repeat SAVE YOUR MOTOR
Your mechanic is a moron

lexjer

WOW!!!4 days looking for the wires harness for my sensor and no one sell them. any place in california (orange or riverside areas), ... some one knows? i just wonder how long the sensors last in a engine 10 15 20 years? depends on luck?

python

iTrader: (4)

the dealer! and im telling u right now if u dont change the starter and the sensors u will be one sorry dude. get a denso starter,sensors and connectors from the dealer and have this job done right otherwise u will be paying for it later.

lexjer

wow!!!!! I ordered the knock sensor wire harness for $106 from the local lexus dealer
now I recieved a call to let me know it was not $106 any more but $203
is only a few cables, why can it be so expensive, has anyone purchase these cables before for the same price avobe mentioned?

python

iTrader: (4)

thats way too much...i got mine for 35 dollars each 3 years ago

curepunx

iTrader: (3)

Before you actually take the dive on purchasing the so-called harness/wiring, i would consider getting a second opinion from a competent+experienced mechanic. As for good prices on oem parts, contact Sewell Lexus or Carson Toyota. Make sure to let them know you're a member of Club Lexus for a suitable discount.