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^^ Interesting to see that this suggest the Throttle Body has been modified/changed despite the part number having remained the same - This sort of sucks as I was hoping to just swap the hoses and clean teh throttle body and hopefully put this worry behind me given that my warranty is about to run out in a few months .
In the original TSB bulletin that was posted, only the hose part numbers had changed but the last line of the image you posted, it states "The throttle body and motor ... have been modified"
Yep it’s an interesting turn of events. I wish it was a recall instead of a ‘in case it breaks’ situation. Me rolling up there with my 40k mile self will not be entertained. 😜
^^ So I went back to page 2 of this thread and the TSB that was posted there contained the same language (i.e. it is the same as you posted). What is confusing and misleading is that the word section suggests a new throttle body assembly while the part section suggests only the hoses have a new part number. Can they replace a part and keep the original part number (referring to the Throttle Body)? This is where I hope someone with lots of experience can chime in I remember a user (Sasnuke) was amazing for this type of stuff but I don't see him on here anymore
I was given this screenshot and told I could share.
Apparently end of July Lexus released a Service Bulletin(L-SB0032-25) for our throttle bodies. They were redesigned with a new part number.
This also covers every 2UR all the way back to the ISF, which leads me to believe it's a permanent item that's marked in their system if it fails in the future.
You won't be able to request a part swap preemptively, but it'll be better documented if it does ever fail in the future and you'll get the new version of the part.
Some piece of mind if you encounter it later on and one less thing to worry about.
This is why I had my doubts that just the hoses were supposed to fix anything. We can only hope that Lexus will do the right thing and honor this SB past warranty or the SB date if it happens to us later on.
The 38030 is a throttle body that seems to fit 08-2014 ISF. There is no new part number for the throttle body for the is500, etc.. not that I can find. TSB still lists the 38050 number.
If the throttle body has the same part number, then how do they know if a throttle body is the updated version?
They might not need to know. If your campaign has been done then they know it's got the new version.
Probably any throttle bodies manufactured after a certain date will be updated is my guess.
Unless the throttle body PN has been changed, or if it has some traceability like date code printed on (which would be mentioned in the TSB if it was important), then I don't see how the throttle body could be updated.
There are tons of TB's stocked in warehouses across the country that are "old". This TSB says that the dealers are just putting in the same ones, from the same logistics/distribution chain back into the cars. This is exactly why part number succession works; so that parts can be differentiated through the supply chain, even if nothing material actually changed on the part.
Unless the throttle body PN has been changed, or if it has some traceability like date code printed on (which would be mentioned in the TSB if it was important), then I don't see how the throttle body could be updated.
There are tons of TB's stocked in warehouses across the country that are "old". This TSB says that the dealers are just putting in the same ones, from the same logistics/distribution chain back into the cars. This is exactly why part number succession works; so that parts can be differentiated through the supply chain, even if nothing material actually changed on the part.
I tend to agree, I worked at TMMC (while not in manufacturing side, in IT) and helped developed internal portal for tracking part changes and they would have explicit part number or at least a minor revision indicator for every single change. They have to track if it changed, its plain and simple traceability. So if they havent changed, why bother replacing. Is that because of the tubes enhancement, the old throttle body is "dirty/damaged" and they just replace it, and fresh one with new pipes is okey-dokey?
I tend to agree, I worked at TMMC (while not in manufacturing side, in IT) and helped developed internal portal for tracking part changes and they would have explicit part number or at least a minor revision indicator for every single change. They have to track if it changed, its plain and simple traceability. So if they havent changed, why bother replacing. Is that because of the tubes enhancement, the old throttle body is "dirty/damaged" and they just replace it, and fresh one with new pipes is okey-dokey?
Maybe they don't want to say it but they could have had some manufacturing defects on some units so they just replace them with the same part number but with hopefully better quality control. This is probably like the bumper sagging saga. It won't happen to everyone but for the few that it does, they just apply a bandaide and move on.
Maybe they don't want to say it but they could have had some manufacturing defects on some units so they just replace them with the same part number but with hopefully better quality control. This is probably like the bumper sagging saga. It won't happen to everyone but for the few that it does, they just apply a bandaide and move on.
If you make a change like that, you don't usually "hope" for better quality control unless there was some very small probability that inventory was affected by the issue or Toyota confirmed service inventory was not affected by the issue.
If there is not going to be a part number change, traceability information should be shared to confirm the part being replaced is post-clean point, either with a serial number change, or similar.
It seems far more likely that whatever change was done to the hose is to prevent the condition from occurring in the first place and that the throttle body replacement is due to whatever that condition is and not a design issue with the throttle body itself. With my engineer hat on, I'd suggest that it is likely some sort of build up or similar on the throttle body and that the risk of negative outcome/customer experience from trying to clean/repair the throttle body means it makes more sense to just replace the throttle body instead. It's a safer repair procedure for a part of the car that comes with safety and regulatory requirements.
If a bumper has a bit of a large gap, the risk of the repair not working is customer annoyance, but if the throttle body is not working properly, you may lose full throttle control which is considered a safety risk.
If you make a change like that, you don't usually "hope" for better quality control unless there was some very small probability that inventory was affected by the issue or Toyota confirmed service inventory was not affected by the issue.
If there is not going to be a part number change, traceability information should be shared to confirm the part being replaced is post-clean point, either with a serial number change, or similar.
It seems far more likely that whatever change was done to the hose is to prevent the condition from occurring in the first place and that the throttle body replacement is due to whatever that condition is and not a design issue with the throttle body itself. With my engineer hat on, I'd suggest that it is likely some sort of build up or similar on the throttle body and that the risk of negative outcome/customer experience from trying to clean/repair the throttle body means it makes more sense to just replace the throttle body instead. It's a safer repair procedure for a part of the car that comes with safety and regulatory requirements.
If a bumper has a bit of a large gap, the risk of the repair not working is customer annoyance, but if the throttle body is not working properly, you may lose full throttle control which is considered a safety risk.
Jeff
I used the word "hope" because of the ways Lexus has tackled other issues; fuel pumps, exhaust gaskets, bumpers. They don't do recalls, they just wait for people to be affected and then fix it although they know about the issues. If they're replacing the rubber hoses, that's a design issue. Good on them for replacing the whole throttle body plus hoses. Toyota Highlanders that had bumper sagging in some cases resulted in the whole bumper coming off and rolling under the vehicle at highway speeds. That's a huge safety concern that luckily our ISs have seen yet. I wouldn't call that an annoyance.
Last edited by Benibiker1558; Sep 12, 2025 at 04:22 PM.
^^ I am not sure how the Highlander's bumper is fastened but ours is fastened by more than just clips, but also a 10 mm bolt holding things together Not that it makes it acceptable but at least we shouldn't worry about losing our whole bumper.
What worries me the most, and sort of surprises me, is that some people have experienced instant loss of throttle response and this has happened on the highway or while merging on highways. To me, a sudden loss of acceleration when pulling into an intersection or highway is worrisome and surprised they don't do a safety recall? Then again, I am far from being an expert on the matter so I'll stay in my lane
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I remember a user (Sasnuke) was amazing for this type of stuff but I don't see him on here anymore 
