Valley Plate Leak
TPMS sensors go to Costco. Like 30 dollars each with programming. My stealership wanted 1k for tpms sensors on my dads RX400h as well. I just laughed in their faces and for under 150 bucks did all four.
I told ya bro, you shouldn’t be wearing your gator loafers or your Patek Phillipe watch. They see you coming a mile away and they be ready to pounce.
TPMS sensors go to Costco. Like 30 dollars each with programming. My stealership wanted 1k for tpms sensors on my dads RX400h as well. I just laughed in their faces and for under 150 bucks did all four.
TPMS sensors go to Costco. Like 30 dollars each with programming. My stealership wanted 1k for tpms sensors on my dads RX400h as well. I just laughed in their faces and for under 150 bucks did all four.
Until I see some actual service invoices showing LC’s being affected I’ll remain skeptical. I agree with others here that the sealant being used must have been upgraded since this became an issue several+ years ago . But if any LC is affected then it’s a 2018 or newer issue which would be a bit disconcerting to say the least.
Has anyone tried reaching out to Lexus about this, and/or are they good at answering these kinds of things?
Has anyone tried reaching out to Lexus about this, and/or are they good at answering these kinds of things?
Simple fact is very few LC's have gone far enough to develop this issue. As usual any failure has window when it commonly happens. Can be mileage and/or age related but it practically newer is at exact same miles or time. If Toyota haven't done something major its bound to happen at same rate in 100k or whatever miles driven LC's than any other models using same engine. It really shouldn't as Toyota has had plenty of time to change things. If they have it should be easy to find what they changed and when simply by looking parts diagrams or some new instructions how to fix issue at dealer service. When none exists issue is still there waiting to happen at same rate as on other models. For most first owners this doesn't matter. It only starts to if issue is so bad that engine needs rebuild at 100k. At that stage trade in value 1st owner gets is affected once issue becomes common knowledge.
....LC owners ain’t concerned bout potential valley plate issues. We love this car so much that the thought of having to pay up to fix a problem due to a potential poor design is alright by us…..Gotta pay to play....
Gonna hit 60k pretty soon. I’ll have my indie shop use a boroscope to see what the situation looks like on my LC at the moment. It is a fairly common issue I’ve heard about during my F/LC ownership especially with older cars with higher miles. I think it’s likely that most 2URs will eventually see this issue at some point. I don’t think many LCs have experienced it yet as they’ve only been out for 5ish years and most owners don’t drive theirs too much. I daily drive mine so I’m sure I’ll hit higher miles much sooner than most and run into this issue sooner.
All you wishful thinkers believing this issue has been addressed are dead wrong. TIS shows the same sealant today that Lexus prescribed in 2008 for the same plate in the same block with the same part numbers. Please just stop.
Evidence this is related to the switch to SLLC (pink) coolant is also anecdotal at best, and just plain misleading at worst. Bet money I could run pure distilled water and still have this issue. No sealant lasts forever. I had to drop the oil pans on my Supra to fix a leak between the upper aluminum oil pan and the cast iron block because those two parts have different rates of expansion and contraction - over time, the silicone gets shredded and fails. At least the valley plate and the block are both aluminum, but the simple fact they chose expedience in assembly over longevity (o-ring or hard gasket sealing) means we're all going to have this happen at some point. My IS F had the problem, but it was pretty minor even at 180k miles. The wife's 2016 GS F just developed the problem in the last 3 months because I checked the coolant level when I did the last oil change - it was perfect - and last week I checked it before setting off on an 8 1/2 hour drive to Virginia, and muck fee; the coolant tank was almost empty and there is zero evidence the coolant pump needs to be replaced.
I'll fix it when it gets serious. For now I'll keep an eye on it, but I already have one car apart in the garage. I don't need two down at the same time.
Evidence this is related to the switch to SLLC (pink) coolant is also anecdotal at best, and just plain misleading at worst. Bet money I could run pure distilled water and still have this issue. No sealant lasts forever. I had to drop the oil pans on my Supra to fix a leak between the upper aluminum oil pan and the cast iron block because those two parts have different rates of expansion and contraction - over time, the silicone gets shredded and fails. At least the valley plate and the block are both aluminum, but the simple fact they chose expedience in assembly over longevity (o-ring or hard gasket sealing) means we're all going to have this happen at some point. My IS F had the problem, but it was pretty minor even at 180k miles. The wife's 2016 GS F just developed the problem in the last 3 months because I checked the coolant level when I did the last oil change - it was perfect - and last week I checked it before setting off on an 8 1/2 hour drive to Virginia, and muck fee; the coolant tank was almost empty and there is zero evidence the coolant pump needs to be replaced.
I'll fix it when it gets serious. For now I'll keep an eye on it, but I already have one car apart in the garage. I don't need two down at the same time.
Last edited by lobuxracer; Jun 9, 2023 at 01:23 PM.
All you wishful thinkers believing this issue has been addressed are dead wrong. TIS shows the same sealant today that Lexus prescribed in 2008 for the same plate in the same block with the same part numbers. Please just stop.
Evidence this is related to the switch to SLLC (pink) coolant is also anecdotal at best, and just plain misleading at worst. Bet money I could run pure distilled water and still have this issue. No sealant lasts forever. I had to drop the oil pans on my Supra to fix a leak between the upper aluminum oil pan and the cast iron block because those two parts have different rates of expansion and contraction - over time, the silicone gets shredded and fails. At least the valley plate and the block are both aluminum, but the simple fact they chose expedience in assembly over longevity (o-ring or hard gasket sealing) means we're all going to have this happen at some point. My IS F had the problem, but it was pretty minor even at 180k miles. The wife's 2016 GS F just developed the problem in the last 3 months because I checked the coolant level when I did the last oil change - it was perfect - and last week I checked it before setting off on an 8 1/2 hour drive to Virginia, and muck fee; the coolant tank was almost empty and there is zero evidence the coolant pump needs to be replaced.
I'll fix it when it gets serious. For now I'll keep an eye on it, but I already have one car apart in the garage. I don't need two down at the same time.
Evidence this is related to the switch to SLLC (pink) coolant is also anecdotal at best, and just plain misleading at worst. Bet money I could run pure distilled water and still have this issue. No sealant lasts forever. I had to drop the oil pans on my Supra to fix a leak between the upper aluminum oil pan and the cast iron block because those two parts have different rates of expansion and contraction - over time, the silicone gets shredded and fails. At least the valley plate and the block are both aluminum, but the simple fact they chose expedience in assembly over longevity (o-ring or hard gasket sealing) means we're all going to have this happen at some point. My IS F had the problem, but it was pretty minor even at 180k miles. The wife's 2016 GS F just developed the problem in the last 3 months because I checked the coolant level when I did the last oil change - it was perfect - and last week I checked it before setting off on an 8 1/2 hour drive to Virginia, and muck fee; the coolant tank was almost empty and there is zero evidence the coolant pump needs to be replaced.
I'll fix it when it gets serious. For now I'll keep an eye on it, but I already have one car apart in the garage. I don't need two down at the same time.









