RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

RX300 knock sensor replacement DIY

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Old 12-06-16, 05:51 PM
  #136  
hypervish
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Originally Posted by salimshah
Hyper if the service manual indicates a part should be replaced "diamond" notation, I would change it. Your time and labor is worth a lot and no point in going back and redoing it.

Salim
Good point! Gaskets have been ordered!
Old 12-15-16, 06:39 PM
  #137  
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Thanks for the DIY Salim! Knock sensors have been successfully replaced! Everything went very smoothly and RX is running great, ready for another 240,000 miles!
Old 12-15-16, 07:01 PM
  #138  
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Glad things went well.

I just wish there was a tunnel to get to the knock sensors. Did you replace the bypass hose or just pushed it aside?

Salim
Old 12-16-16, 04:47 AM
  #139  
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Hyper, well done my friend!
Old 12-16-16, 06:23 AM
  #140  
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Originally Posted by CharBaby
Hyper, well done my friend!
Thanks!

Originally Posted by salimshah
Glad things went well.

I just wish there was a tunnel to get to the knock sensors. Did you replace the bypass hose or just pushed it aside?

Salim
Yeah, a tunnel would be nice! haha. I didn't replace it, mine was also in good shape by the looks of it so I just pushed it aside.
Old 05-22-17, 12:39 PM
  #141  
mrednall
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I have a 2003 Lexus GX 470 with a V8 engine and need to replace knock sensors. Is this close to the same steps I need to replace mine.
Old 05-22-17, 01:17 PM
  #142  
salimshah
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Originally Posted by mrednall
I have a 2003 Lexus GX 470 with a V8 engine and need to replace knock sensors. Is this close to the same steps I need to replace mine.
Best to ask the same question on GX forum and point back to this thread.

I would say other than in the things being same in 'theory' we are talking about different engine here .. traverse mounted v6 vs front-to-back V8.

Salim
Old 09-13-17, 08:12 AM
  #143  
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2000 RX300 with 275K miles

I have the dreaded P0330 knock sensor circuit 2 problem.

I followed this great tutorial and I replaced both sensors, along with the wire and gaskets over the weekend. Well, after 50 miles of CEL-free driving the code decided to come back. I am absolutely stumped as to how I could have solved the problem, but it then came back 50 miles later. Now the CEL comes on every couple miles after you clear it. I have a ScanGauge II which is a great OBDII reader, reads and clears CEL but has other info like freeze frame info when a code gets thrown. I can post that stuff here if it's useful.

Also, water leak started around same time in the cabin, definitely radiator fluid, smells like it anyway, could it be the heater core? Could this cause CEL?

Car also had P0171 and the other MAFS code I forget what it is but I solved those by cleaning the MAFS with a spray bottle of MAFS cleaner... P0171 went out at the same time. I did all that maybe 100 miles before I did the knock sensor replacement.
Old 12-30-17, 07:15 AM
  #144  
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Thumbs down knock sensor wire harness

Originally Posted by salimshah
There is only one harness ... connects to the knock-sensor to the main harness.

The connectors get hot and over time they disintegrate. In my case, I was hesitant to pre-order them but decided to purchase it and it was the right decision.

Salim
could you elaborate on where the wires go and how hard are they to change
Old 12-30-17, 09:13 AM
  #145  
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Knock sensors are screwed into the engine block. The 'wire' connects the sensors to the wiring harness.

Since the teardown is huge, I would replace the sensors and the wire, even if only one parts has gone bad.

Salim
Old 01-29-18, 03:19 PM
  #146  
Rowland3
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Default Knock sensor

OK so my Lexus is not showing in to overdrive I've read about it being a couple things ones the solenoid in the trans and the seconds the knock sensor I've ran the cods on it and only cod I'm going is and has Ben a o2 sensor and it's Ben bad for a couple years now any suggestions
Old 01-29-18, 04:16 PM
  #147  
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Originally Posted by Rowland3
OK so my Lexus is not showing in to overdrive I've read about it being a couple things ones the solenoid in the trans and the seconds the knock sensor I've ran the cods on it and only cod I'm going is and has Ben a o2 sensor and it's Ben bad for a couple years now any suggestions
Knock sensor will light up your cell with the code for knock sensor.
Did you clear the codes [O2] and did you get the OD back?

Salim
Old 01-30-18, 12:54 PM
  #148  
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Originally Posted by salimshah
Knock sensor will light up your cell with the code for knock sensor.
Did you clear the codes [O2] and did you get the OD back?

Salim
yes it has batts Ben unhooked parts store cleared the code and all no knock road has ever shown up but I'll tell u wat soon as I leave work I'll have it done again and let u know and the o2 is a ever since I got the truck 2 plus years ago the not shifting is since just this past spring

OK update just had it looked at again and it's saying both r bad so I guess I'm in for a job soon to guys for the help

Last edited by Rowland3; 01-30-18 at 01:42 PM.
Old 02-27-18, 04:44 PM
  #149  
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This is what I have for parts so far. These are for the 2002 RX300, I know the older and maybe newer 1st gen might have different part numbers and even knock sensor size.

So here is my list for replacements:

(2) Knock Sensors: 89615-12090
(1) Sensor Wire: 82219-07010
(1) Bypass Hose: 16261-20010
(2) Hose Clamps: 90467-28007
(1) Surge Tank Gasket: 17176-62030
(1) Passenger Right Intake Manifold Gasket: 17177-20020
(1) Driver Left Intake Manifold Gasket: 17178-20020

The spark plugs aren't that hard to get to, so I'm leaving them off the list.

Does this look right?
Old 08-13-18, 04:48 PM
  #150  
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Default timing belt and knock sensor

RX300 2000 I have p0330 planning to get knock sensor and harness replaced. My timing belt and water pump is also due. Do you think its a good idea to do it at the same time to save some money and what about by pass hose change?


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