RX500h CEL, into the shop
03-05-23, 07:45 AM
#1
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RX500h CEL, into shop for round 2, staying in the shop
Really liking the RX500h.
But, it threw a Check Engine Light.
The on-board diagnostics say vacuum leak. The shop has found not leaks and on-board electronics show no electronic faults.
The CEL and vacuum leak code re-appear after clearing.
Next step is for the Lexus regional team to assist with hook up with their PCs/diagnostic tools and get deeper into the diagnosis and trouble shooting.
In the meantime we have an ES300h as a loaner.
Will share what is found/fixed.
But, it threw a Check Engine Light.
The on-board diagnostics say vacuum leak. The shop has found not leaks and on-board electronics show no electronic faults.
The CEL and vacuum leak code re-appear after clearing.
Next step is for the Lexus regional team to assist with hook up with their PCs/diagnostic tools and get deeper into the diagnosis and trouble shooting.
In the meantime we have an ES300h as a loaner.
Will share what is found/fixed.
Last edited by Tacoshawn; 04-04-23 at 08:08 PM. Reason: updating the title.
03-05-23, 10:50 AM
#2
This is a strange problem to have on an engine with direct injection - usually it would be the pump being bad or a visible leak/loose hose assembly.
03-05-23, 11:35 AM
#3
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03-05-23, 12:16 PM
#4
Yikes hope they find the fix!
03-07-23, 08:20 PM
#6
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After extended trouble shooting including technical assistance from Lexus no mechanical or electrical faults were found. They went ahead and reset the codes, did multiple drives with stop/start cycles and the fault stayed cleared. So, attributed to a ‘glitch’ yesterday and we took back the RX.
Driving fine, no CEL. Hopefully it was only a ‘glitch’. Will post back in the future if it stays clear or reappears.
Driving fine, no CEL. Hopefully it was only a ‘glitch’. Will post back in the future if it stays clear or reappears.
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FMY421 (03-09-23)
03-29-23, 09:37 PM
#7
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Well, 3 weeks later it threw the CEL and put the check engine message on the multi-function display, again. Back into the shop.
To say I’m disappointed is a understatement.
Will share what, if anything, they come back with this time.
To say I’m disappointed is a understatement.
Will share what, if anything, they come back with this time.
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FMY421 (03-30-23)
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03-30-23, 07:49 AM
#8
03-30-23, 09:27 AM
#9
They aren't looking hard enough for the mis-fitting hose -- loose clamp, etc. You are sure they are communicating the correct code to you as a "vacuum" leak, and not a leak in the evaporative emissions system, which spans the fuel system sensors, etc? Did you refuel the car shortly before (1-2 days) the light came back on?
03-31-23, 08:31 PM
#10
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Friday update, the car was driving fine.
The service department called today and want to keep it to get Lexus out to help with deeper dive into the RX. We are heading out of town next week and told them they can have it as long as they need.
The service department called today and want to keep it to get Lexus out to help with deeper dive into the RX. We are heading out of town next week and told them they can have it as long as they need.
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Julius071 (04-01-23)
04-01-23, 01:57 PM
#12
Indeed, that's why they have to be precise about whether the code is vacuum, or evap emissions. You can't diagnose a bad gas cap without simply replacing it as a precaution and seeing if the CEL comes back (or extinguishes on its own). The dealer must know this I assume, so it really must be a vacuum issue.
04-04-23, 08:07 PM
#13
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Another update to be followed by a pause. Root cause remains unknown, Lexus is involved and has shared with dealership that there is an issue related to CEL warnings on some RX500h.
The 500h will be staying at the shop until root cause is resolved.
My speculation is it is a software/limits issue and they are having to turn a S/W build and validate before turning it back to us.
We are out of town and will pick up a service loaner when we return next week.
The 500h will be staying at the shop until root cause is resolved.
My speculation is it is a software/limits issue and they are having to turn a S/W build and validate before turning it back to us.
We are out of town and will pick up a service loaner when we return next week.
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FMY421 (04-05-23)
04-05-23, 08:10 AM
#15