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

P0125 And P1135 Codes??

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Old 02-23-06, 10:39 PM
  #16  
Pearlpower
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Aftermarket o2 sensor can be had from your local auto parts store from 70-85$ . They are just as good if not better than the OEM versions. You just need to splice them in. They come with all of the wiring connectors and will last just as long as well. I always replace the two front ones in pairs. When one goes out it is not long before the other does as well.
Old 03-14-06, 05:55 PM
  #17  
mr. aristo
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Originally Posted by willie83
My 99 RX300 was throwing codes 0171, 0125, 1135, and 1133. All indicated bank1, sensor1 (firewall side on exhaust manifold before cat). I spent a lot of time researching these and other forums. During that time, I cleaned the MAF, used carb cleaner down the trottle body, and clearing the codes, and they always came back. The car really started running very poorly, no power, rough idle, and crappy gas milage.

OxygenSensors.com has the right A/F ratio sensor for $170.98 with free shipping. Also the sensor socket for $9.95. Denso Part #234-9009. Identical to the original.

You will need a long handle ratchet or extention to get enough torque. Be sure to use some penatrating oil the night before. I also had to put a hose calmp around the split socket to keep it from spreading out! That baby was tight! Once it broke loose, it began to get tight again. I had to work it back and forth a few times and it finally came out. The threads closest to the end looked like they got left behind. I stuck my finger up in there and it felt clean; threads were deep. Put the anti-seize on and screwed the new sensor in and plugged it in. Oh, I forgot to mention what a pain to unplug. Need to get both hands up there to squeeze and pull, probably easier when on a lift.

All said and done for $181.00 and the car runs like new. No new codes after 300 miles.
will that part number work for p1130 code a/f bank1 sensor1? and i need to purchase 2 of the part number 234-9009?
Old 04-05-06, 07:27 AM
  #18  
garvard
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My 99 RX300 has the same problem. At first it was P0125 and P1135. On next day scanner show P1130 O2 Sensor Circuit (Bank 1 Sensor 1). If someone know where is located this sensor: before cat converter or after.
You have posted 3 photos of oxygen sensor. Which one (I mean photo) is of sensor I need to change?
Thank you.
Old 04-05-06, 10:16 AM
  #19  
slick20
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as lexmex has posted in one of his earilier post, it is on the rear exshust manifold near the fire wall.you can only accacess this from underneath the car.lexmex has a pic.of this in anouther post.not hard to change. just getting the plug undone is hardest part. you will need ramps, also spray sensor with penatrating oil before trying to remove.
Old 04-15-06, 01:20 PM
  #20  
ynvme
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Is there a way of getting around taking out the driver seat to change this ?
Old 01-29-07, 10:11 AM
  #21  
p1fcl01
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Sorry, I have the same problem and would like a little help. If i have the 0125 and 1135 message, which one from Lemerex pictures should I change or all should be change, is it 2 or 3 a/f sensors. Thanks
Old 01-29-07, 10:24 AM
  #22  
Lexmex
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Originally Posted by p1fcl01
Sorry, I have the same problem and would like a little help. If i have the 0125 and 1135 message, which one from Lemerex pictures should I change or all should be change, is it 2 or 3 a/f sensors. Thanks
You need the A/F sensor(s) before the cat. Whether it is the front or rear manifold can depend on what the OBDII readout says, sometimes it doesn't tell which sensor (or bank). Only way you can really find out is by having someone with a more advanced OBDII sensor see what the readings are on both A/F sensors to determine which of the 2 are faulty.

The other sensor, O2 sensor, is after the cat below the vehicle. That would throw a different code.
Old 02-01-07, 09:02 AM
  #23  
p1fcl01
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Lexmex,

AutoZone states bank 1 sensor 1 on P1133. Is that the one under the passenger seat and NOT the one under the hood? I like to get this fix asap. Thanks for your help.
Old 02-01-07, 09:17 AM
  #24  
Lexmex
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Originally Posted by p1fcl01
Lexmex,

AutoZone states bank 1 sensor 1 on P1133. Is that the one under the passenger seat and NOT the one under the hood? I like to get this fix asap. Thanks for your help.
It's this one behind the engine as shown.

Bank 2 sensor 1 is the one you can see when you open the hood and Bank 1, sensor 2 is the one underneath your seat and behind the catalytic converter and in front of the resonator
Attached Thumbnails P0125 And P1135 Codes??-img_0833.jpg  
Old 02-03-07, 04:06 PM
  #25  
LC1338
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Here is a link to a post on ES300 forum that might be helpful. It's kind of long but has good info if you can read through it all.

https://www.clublexus.com/forums/sho...ight=o2+oxygen

RX and ES have basically the same engine.
Old 02-07-07, 11:31 AM
  #26  
p1fcl01
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I got the OEM Toyota sensor yesterday from ebay $100, what a deal. Now I'm getting different information as to the size wrench I need to use. Some say 7/8 and some 22mm, which one should I use?

Thanks
Old 02-07-07, 09:24 PM
  #27  
LC1338
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7/8 inch and 22mm are practically the same size. There is only one size O2 sensor socket and you can buy it from AutoZone or Advance Auto Parts for about $11.
Old 02-10-07, 03:37 PM
  #28  
p1fcl01
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LC1338 and LEXMEX, HELP,

Ont he above link on how to change the o2 sensor, he stated this:
First I had to unlatch the tab on the side of the old connector and disconnect it

I am right now doing it and I can't seem to get the connector apart. Is there a latch that I need to unlatch, and how is that done, there's not much room? Can someone help me asap?

Thanks

Frankie
Old 02-10-07, 04:45 PM
  #29  
Lexmex
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I have actually never replaced any of the A/F/O2 sensors in my RX300.

However, my uncle and I did incidentally change out an A/F sensor today on a Nissan Tsuru (like an old Sentra) so that it could pass emissions. Now on those, the little latch (and I can't see it in the photo on this link) usually in most cases one has to use a flathead screw driver OR has to be pressed down firmly with two fingers in order to pull it out, but usually the prior.

Earliest I could take a look at this would be tomorrow morning.
Old 02-10-07, 06:25 PM
  #30  
p1fcl01
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Thanks LexMex,

I stopped and went inside the house, its too cold here in NY freezinf temp. Tomorrow morning is fine.
The thing had to be a latch since I did tried to squeezed both side of the plug and couldn't get it off. I might try a small screw driver tomorrow.
Thanks much Frankie


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