DIY: Replacing air/fuel sensor
#226
If you are having fuel consumption issues, changing your AF sensors may help with your mpg. Prior to attempting that, ensure you dont have any air leaks between your MAF sensor and the throttle body or any other vacuum leaks. Unmetered air might be telling the ecu to dump more fuel.
#227
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CEL came back on
Something upstream leading to damage/contamination to the A/F sensor?
Thanks for your help guys.
#228
Shopping for replacement part:
The Lexus part number for the RX300 air/fuel sensor is 89467-48011. The OEM a/f sensor is made by Denso and the Denso part number is 234-9009. The two are equivalent.
Lexus sells the part for ~$300. Toyota sells the part for ~$200. You can generally find one on eBay for ~$150. I found the part on Amazon for $126 with free shipping; by far the best deal. I ordered it on a Monday and received it Wednesday.
Here is the Amazon part for reference (Sept 2009). If this link dies in the future, just search Amazon with "Denso 234-9009" and you'll find it assuming they still stock it.
http://www.amazon.com/Denso-234-9009-Air-Fuel-Sensor/dp/B000C5YCZ2/ref=sr_1_1?ie=UTF8&s=automotive&qid=1253794019&sr=8-1
Note: Amazon's cross-reference chart doesn't list the RX300, but don't let that stop you. The part number is correct.
The Lexus part number for the RX300 air/fuel sensor is 89467-48011. The OEM a/f sensor is made by Denso and the Denso part number is 234-9009. The two are equivalent.
Lexus sells the part for ~$300. Toyota sells the part for ~$200. You can generally find one on eBay for ~$150. I found the part on Amazon for $126 with free shipping; by far the best deal. I ordered it on a Monday and received it Wednesday.
Here is the Amazon part for reference (Sept 2009). If this link dies in the future, just search Amazon with "Denso 234-9009" and you'll find it assuming they still stock it.
http://www.amazon.com/Denso-234-9009-Air-Fuel-Sensor/dp/B000C5YCZ2/ref=sr_1_1?ie=UTF8&s=automotive&qid=1253794019&sr=8-1
Note: Amazon's cross-reference chart doesn't list the RX300, but don't let that stop you. The part number is correct.
I know this is a very old thread, but just a heads-up on the pic that you attached of your new sensor's box:
The box end label correctly shows Denso P/N 234-9009 which is the right number for the Air/Fuel Sensor. However, that box incorrectly shows "Oxygen Sensor" on the box long side, which is not correct. I know for a fact because I have the same Denso P/N 234-9009 box, and it is correctly printed Air/Fuel Sensor on the box long side. HTH.
Btw, my new Denso P/N 234-9009 (on the box) has these numbers on the part itself: 192400-807O (yep, that's a Cap "O" as in o-ring), then 04S01 under that.
Btw, My job was the sensor up front (bank 2 sensor 1). Didn't even have to get my tee shirt dirty. The hardest part was getting the electrical connector off: I removed a little ring that holds some spark plug wires in place above the sensor, moved the wires back against the engine, and this allowed easier access to the connector from the top down. I finally used some very long needle nose pliers to depress the latch lever (without cutting the shielding on the engine side of that connector). If your hards are strong enough, you might just be able to squeeze/push down on the latch lever with your fingers, while wiggling and pulling out on the plug and sensor wires.
I hit the old sensor threads with PB Blaster about half an hour before taking a 7/8" box end wrench to it. I read elsewhere that overnight is even better. Wrench is 12" long overall, and the top of the wrench was just able to slide under an AC line that's on the evaporator. I wouldn't want to try with anything shorter. I had to pull on it pretty good to get it turning.
Helpful thread. Thanks :-)
Regards . . .
P.S. Off-topic: A new topic in a forum is called a thread. Replies to the original poster's thread are called "posts" to the thread. So we could say, "I logged into Club Lexus made a new thread about sensors, and several people have made posts to it since yesterday". It's a bit confusing, but that's forum history.
Last edited by Brcobrem; 03-18-17 at 08:53 AM. Reason: added content
#229
Driver School Candidate
Well, I've been watching this thread and others here on CLF and have learned much. About 50,000 miles ago I replaced two of my sensors successfully. Recently got the dreaded p1150 code along with p0172. Replaced the bank 2 sensor 1 A/F circuit, but still got the code. Replacing the Bank 1 Sensor 1 today. Hoping for the best. As I recall, last time I changed one, but still got codes and they didn't go away until I replaced the second. Not sure if only doing one (on the front side of exhaust) just screws up the mixture and computer, but eventually remembered what happened last time. Will let you know what happens. By the way, my box also says air/fuel sensor on the side.
#230
Hi mikecd1,
I replaced the A/F sensor on the rear header on 1/14/2013. That's a little over 3 years ago. No A/F sensor codes since then until a couple months ago (when I bought the new Denso part but did not install until a couple days ago). This time as previously mentioned, it was the one on the front header. I don't recall this fact about the first one, but this time I did pull that ECU fuse for over an hour, but I still had the engine light on and the codes still showed also after starting the engine. Read on please.
I'm using The paid version of Torque (on Android) and an authentic bluetooth enabled "ODB Diagnostic Interface" (from BAFX Products) to read the codes. That software has a "Clear Codes" function. So . . . I did a Save to save the current code(s) for our future reference, then I did a Clear Codes. The codes in Torque and the dashboard engine trouble light immediately went away. Since then, I had a 60 mile road trip at sustained speeds up to 65mph, and no codes have reappeared (yet :-) .
Regards . . .
I replaced the A/F sensor on the rear header on 1/14/2013. That's a little over 3 years ago. No A/F sensor codes since then until a couple months ago (when I bought the new Denso part but did not install until a couple days ago). This time as previously mentioned, it was the one on the front header. I don't recall this fact about the first one, but this time I did pull that ECU fuse for over an hour, but I still had the engine light on and the codes still showed also after starting the engine. Read on please.
I'm using The paid version of Torque (on Android) and an authentic bluetooth enabled "ODB Diagnostic Interface" (from BAFX Products) to read the codes. That software has a "Clear Codes" function. So . . . I did a Save to save the current code(s) for our future reference, then I did a Clear Codes. The codes in Torque and the dashboard engine trouble light immediately went away. Since then, I had a 60 mile road trip at sustained speeds up to 65mph, and no codes have reappeared (yet :-) .
Regards . . .
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mikecd1 (03-22-17)
#231
Driver School Candidate
Just as an update, after replacing S1B1 and S1B2 I am happy to report that codes have not returned and the car is running great! Drove about 20 miles although yesterday was 55 degrees out and today is about 32 degrees. We'll see how she weathers. Also cleaned the MAF sensor along the way so hopefully this is a nice fresh start for my baby. Thanks to all for sharing info. This has been a great resource for me over the years.
#232
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we replaced B1S1 this weekend and had the hardest time opening the connector - we ended up disconnecting the harness bracket/clip (10mm socket) reaching in from above, and opened the harness bracket to rotate the connector (from below) - finally were able to open the connector from beneath the car
we also found that the wiring harness insulation leading to the socket was crumbling (>160K miles), so releasing the harness out of the bracket/clip allowed us to wrap the wiring harness with new insulation before reinstalling it in the bracket again and bolting the bracket down
we also found that the wiring harness insulation leading to the socket was crumbling (>160K miles), so releasing the harness out of the bracket/clip allowed us to wrap the wiring harness with new insulation before reinstalling it in the bracket again and bolting the bracket down
#233
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not so stubborn connector
I had one heck of a time by myself trying to detach the connector because of the lack of room for two hands above or below the sensor. I took a long slotted screwdriver and placed it in the notch of the connector. I had my wife turn the screwdriver clockwise slightly while I got under the car and pulled the connector free. It was a piece of cake to disconnect with another person there!
#235
Driver School Candidate
Nice DIY; the only thing I would add is that my hands are too big to get to the connector from above. I used this grappler gizmo ($15 @ Home Depot) from underneath.
Clip the hooks around the sensor side of the connector, reach up with one hand to open the tab and jiggle the tool with the other hand to loosen the plug; you can tell when success is at hand when the tab doesn't click back down when you let go. You can then reach up and pull out the plug.
Clip the hooks around the sensor side of the connector, reach up with one hand to open the tab and jiggle the tool with the other hand to loosen the plug; you can tell when success is at hand when the tab doesn't click back down when you let go. You can then reach up and pull out the plug.
#236
Earlier in this thread it said "the Lexus part number for the RX300 air/fuel sensor is 89467-48011. The OEM a/f sensor is made by Denso and the Denso part number is 234-9009. The two are equivalent." but in an other thread it recommended to only use Denso 234-9009.
I'm am buying a 2002 RX300. The privies owner has been running for several years with the check engine light (CEL) on with codes of P1135 and P1155.Basically the heater circuit in the Air Fuel sensors are not working which isn't effecting the running of the car (at least after it is warmed up . My problem is I can not pass an E-check with the CEL on.
I ordered two Denso 234-9009 sensors. I received two Toyota - Denso 89467-48011 sensors (# stamped on the part). I decided to use them any way.
When installed the CEL codes went away but the RX300 ran very poorly, very rich.
Now I am confused. Did I receive bad parts or do I really need to only use Denso 234-9009 sensors?
I'm am buying a 2002 RX300. The privies owner has been running for several years with the check engine light (CEL) on with codes of P1135 and P1155.Basically the heater circuit in the Air Fuel sensors are not working which isn't effecting the running of the car (at least after it is warmed up . My problem is I can not pass an E-check with the CEL on.
I ordered two Denso 234-9009 sensors. I received two Toyota - Denso 89467-48011 sensors (# stamped on the part). I decided to use them any way.
When installed the CEL codes went away but the RX300 ran very poorly, very rich.
Now I am confused. Did I receive bad parts or do I really need to only use Denso 234-9009 sensors?
#237
Moderator
Earlier in this thread it said "the Lexus part number for the RX300 air/fuel sensor is 89467-48011. The OEM a/f sensor is made by Denso and the Denso part number is 234-9009. The two are equivalent." but in an other thread it recommended to only use Denso 234-9009.
I'm am buying a 2002 RX300. The privies owner has been running for several years with the check engine light (CEL) on with codes of P1135 and P1155.Basically the heater circuit in the Air Fuel sensors are not working which isn't effecting the running of the car (at least after it is warmed up . My problem is I can not pass an E-check with the CEL on.
I ordered two Denso 234-9009 sensors. I received two Toyota - Denso 89467-48011 sensors (# stamped on the part). I decided to use them any way.
When installed the CEL codes went away but the RX300 ran very poorly, very rich.
Now I am confused. Did I receive bad parts or do I really need to only use Denso 234-9009 sensors?
I'm am buying a 2002 RX300. The privies owner has been running for several years with the check engine light (CEL) on with codes of P1135 and P1155.Basically the heater circuit in the Air Fuel sensors are not working which isn't effecting the running of the car (at least after it is warmed up . My problem is I can not pass an E-check with the CEL on.
I ordered two Denso 234-9009 sensors. I received two Toyota - Denso 89467-48011 sensors (# stamped on the part). I decided to use them any way.
When installed the CEL codes went away but the RX300 ran very poorly, very rich.
Now I am confused. Did I receive bad parts or do I really need to only use Denso 234-9009 sensors?
1) The previous owner does not care about the vehicle
2) The previous owner tried to have it repaired and the issue could not be resolved or the real repair costs too much.
Either way it an indication of keep away.
After the change, did you reset the computer [disconnect the battery for about 20 mins]? Then I would suggest waiting it out till you get another code, or hook up to a live diagnostic tool.
Salim
#238
The mechanic that has been servicing the RX300 since it was out of warranty is a certified mechanic that has worked for my father-in-law for many years (his best mechanic and the brother of the owner). The CEL codes P1135 & P1155 indicates the sensor's heaters were bad. This only means the sensor take longer to reach optimum temperature. The car still runs fine. He could not see spending $200 - $400 per sensor just to turn the CEL off. They do not have E-Check in their area, but we do.
The new parts did turn the CEL off but the car ran very poorly.
I do not know if he reset the computer or not. All I know is he took the new sensors back out and I returned them.
I did not see the post about the 234-9009 and 89467-48011 being equivalent until after I sent the parts back.
I got the parts from EBay for $46 each. The packaging was suspicious with no identification and it did not have the 234-9009 part # on it anywhere.
I want to insure I order the correct parts for without spending $200 each.
The new parts did turn the CEL off but the car ran very poorly.
I do not know if he reset the computer or not. All I know is he took the new sensors back out and I returned them.
I did not see the post about the 234-9009 and 89467-48011 being equivalent until after I sent the parts back.
I got the parts from EBay for $46 each. The packaging was suspicious with no identification and it did not have the 234-9009 part # on it anywhere.
I want to insure I order the correct parts for without spending $200 each.
#239
Moderator
The mechanic that has been servicing the RX300 since it was out of warranty is a certified mechanic that has worked for my father-in-law for many years (his best mechanic and the brother of the owner). The CEL codes P1135 & P1155 indicates the sensor's heaters were bad. This only means the sensor take longer to reach optimum temperature. The car still runs fine. He could not see spending $200 - $400 per sensor just to turn the CEL off. They do not have E-Check in their area, but we do.
The new parts did turn the CEL off but the car ran very poorly.
I do not know if he reset the computer or not. All I know is he took the new sensors back out and I returned them.
I did not see the post about the 234-9009 and 89467-48011 being equivalent until after I sent the parts back.
I got the parts from EBay for $46 each. The packaging was suspicious with no identification and it did not have the 234-9009 part # on it anywhere.
I want to insure I order the correct parts for without spending $200 each.
The new parts did turn the CEL off but the car ran very poorly.
I do not know if he reset the computer or not. All I know is he took the new sensors back out and I returned them.
I did not see the post about the 234-9009 and 89467-48011 being equivalent until after I sent the parts back.
I got the parts from EBay for $46 each. The packaging was suspicious with no identification and it did not have the 234-9009 part # on it anywhere.
I want to insure I order the correct parts for without spending $200 each.
Keep in mind, usually, one sensor dies at a time. There may be something else going on. Glad that you have a competent mechanic working on your vehicle.
Salim
#240
$46 sounds way too cheap to be a real OE or Denso sensor. It sounds like you probably bought fake knock of parts that didn't work well. Order new Denso parts from Amazon or Advance Auto (Advance Auto will price match Amazon) and see how it runs. You should be paying around $100 - $120 each. Most of us just use the Denso part because it works perfect and is 1/2 the price of a Lexus/Toyota OE part.