Turbogn

I have a code of p1135. I am going to repalce the oxygen sensor but I am very confused as to which part is the correct one. Sewell has many listed and other sources show different part numbers. These are what I have found.

Toyota 89467-48011
denso 234-9009
toyota 8946741011
toyota 89467-48010
toyota 89465-49075

I need the sensor for a 1999 Rx300. Can someone please help me make some sense of this. Thank You
Sal

code58

Turbogn- The 1st 2#'s that you have are the good #'s. The # ending in 10 was the original # but has been changed to the 11. The Denso # should be the same sensor but with the Denso # instead of Toyota. Forget the rest of the #'s- it'll only confuse you. The P1135 designates the rear sensor (it is the one that most often goes out), the one next to the firewall. You have to jack the car up and get to it from the bottom- on the exhaust pipe where it comes out of the exhaust manifold. They are most often referred to as oxygen sensors but in fact are air/fuel ratio sensors- 2 very much different things. It's probably not necessary but you can check the sensor- I believe it's the 2 black wires that are the heater. With a DVM you can do a continuity check on those wires and if no continuity you know the heating element is broken. It's the most common problem with them, but doesn't normally happen til about 100k mi. Good Luck!

chenxingha

Check the threat on gas mileages. Some one mentioned that there are three oxygen sensors - two of which are for air-fuel ratios, I guess. There are several specific discussions (locations and which to replace first, etc.) about the P1135 code in that thread. There is also a thread on P1135 not long ago. It may be helpful to read them before ordering parts, as they are expensive and often not returnable.

bob2200

Maybe my RX is unusual, but I had all 3 of mine fail in the 50-60,000 mil range.

lexus114

average Air flow sensor life is around 60k,It is some what unusual that the post cat 02 sensor went that quickly.

code58

Bob- just curious, did they all fail at the same time? I have to say that is pretty low miles for all 3 to fail. The most common failure is the P1135- which designates B1 S1 which is the sensor next to the firewall and the failure for that code is the heater. The car normally runs fine, just a little rough (not much) til it gets warmed a little and goes into closed loop. I am always suspicious when all 3 fail at the same time- that is NOT what I would consider normal. Using a silicon sealant that is not sensor safe will wipe them out in a hurry.

bob2200

Well, the first two were replaced several years ago by a dealer in Virginia, when the car was still under the basic warranty. I just got the check engine light and brought the car in. This was maybe in the 40-50,000 mile range actually. I guess I don't know they were both bad, but they said they replaced two. I had the car back in less than an hour.

The second event occurred last winter, at a shade under 60,000 miles, and I took it to a Lexus dealer in Florida, since the car was just within the extended warranty I had purchased. The symptom was again just the check engine light. I'm thinking they replaced the rear sensor near the exhaust since they said they soaked the threads in solvent for several hours before attempting to remove the sensor (and thus kept the car overnight).

Since I didn't do the repairs myself, I don't have much more information. Sorry.

code58

My DIL's RX had a little over 100k mi. on it when I replaced the A/F ratio sensors. Only the rear one (by the firewall) was bad but I replaced both because of a medical crisis and I didn't want her to have problems while she was 1200 mi. from home for 6 mo. The B1 S2 (the one that is actually an oxygen sensor- behind the catalytic conv.) seldom goes bad. The rear A/F ratio sens., by the firewall, is often tighter than the front one because it gets more heat. I imagine it is not uncommon in your area of the country to have them seize after a few years because if rust. I had no problem getting the ones out of her car even at 100k mi.- one of the benefits of living on the "rust free" left coast. LOL If they do seize I find the good old "hot wrench" (torch) to be very effective at breaking rusted, thread seized stuff loose.

Lee S.

Just want to thank everyone for this thread. 2000 RX300 with 84k. Pulled codes 0125 (coolant temp), 1135 (fuel air) and 1130 (fuel air). Ordered denso 234-9009 ($171 shipped from oxygensensors.com) for rear bank sensor. Disconnected battery terminals during install. Replaced sensor and reconnected battery. Check engine light has disappeared (all codes are gone) and car is working just fine. Kudos to all

lexus114

lee,did you have any trouble getting the old sensor out?

Lee S.

A little trouble getting it out. Soaked it for a few days with PB Blaster while I was waiting for the sensor to be delivered. Once I got the 2 halves of the connector apart I just slid the old sensor end thru an offset box wrench, got the wrench on the old sensor and it came right out. The biggest trouble was getting the 2 halves of the connector apart...there is not a lot of room to work...had to separate the connector with one hand which is not so easy.

chefwitzel

Whats up all.....

Was wondering if someone could help....

I got an aftermarket O2 sensor or rather, air/fuel ratio sensor without OEM clip. I NEED TO SPLICE into OEM CLIP.

Could anyone let me know what the "Lexus" wires are? There (Lexus) is (2)black, (1)white, and (1) blue...What (2) are high? and what is signal and ground???

2000 Leuxs RX 300; V6...

Thanks for any insight.....

lexus114

i would not recommend after market sensors for this vehicle,it will be a hit or miss.

GARYBUSH

Having the same problem. Hope someone can help.

bob2200

I looked it up in my CD Service Manual. I don't understand the abreviations, but maybe this will help.

For the "Heated Oxygen Sensor", Bank 1 Sensor 2:

pin 1 color B? HT
pin 2 color L-W? +B
pin 3 color W? OX
pin 4 color BR? E1

Air Fuel Ratio Sensor, Bank 1 sensor 1

pin 1 HAFR (right), color L?
pin 2 color B-R?
pin 3 AFR+ (right), color R?
pin 4 AFR-, color G?

Air Fuel Ratio Sensor, Bank 2 Sensor 1

pin 1 HAFL (left), color G?
pin 2 color B-R?
pin 3 AFL+, color L?
pin 4 AFL-, color B-W?