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Lexus IS250: My 2009 is250 recently started showing check complete…

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My 2009 is250 recently started...
My 2009 is250 recently started showing check complete while driving. Also started shutting off on its own when coming to a stop or driving very slow. Have to put it in park to restart it. Turns right back on most of the time.
Submitted: 3 years ago.Category: Lexus
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Answered in 9 hours by:
6/4/2015
Lexus Mechanic: Ron, ASE Certified Technician replied 3 years ago
Ron
Ron, ASE Certified Technician
Category: Lexus
Satisfied Customers: 38,821
Experience: 35 years working as an ASE certified tech.
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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
In most cases if the engine is intermittently stalling the computer should pick up and store a fault code and or codes detecting a problem. If your dealer did not scan the system then the next steps would be to do so. Most part stores can run a scan for you at no charge . If you can get the system scanned and post back with any fault codes retrieved , I will help you from there.
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Customer reply replied 3 years ago
The scan was done with no trouble codes stored. No check engine light. I've read a few forums that show no results for this fix. A few suggestions were the push button start.
Lexus Mechanic: Ron, ASE Certified Technician replied 3 years ago
One other thing you may want to consider doing it to give the throttle body a good cleaning with some carb cleaner and a soft cloth. Before you do so, remove the negative battery cable to clear the closed throttle values. After the cleaning , restart the engine and allow it to idle for about 15 minutes so the computer can relearn the closed throttle values. Give this a try and see if it will solve the stalling concern.
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Customer reply replied 3 years ago
The throttle body was cleaned also by the dealer. It did bring up the idle while in gear a bit. When the car shuts off driving slow it all shuts down, gauges and the whole dash but the radio stays on. When it does it at highway speeds it stalls for a split second and the dash will show check complete like when you start the car.
Lexus Mechanic: Ron, ASE Certified Technician replied 3 years ago
Well at some point the computer should pick something and set a code. Unfortunately until that happens I'm not sure what else to advise you on.
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Customer reply replied 3 years ago
Thanks anyway. I'll try and remember to post what the dealer does when I bring it back today.
Lexus Mechanic: Ron, ASE Certified Technician replied 3 years ago
Okay, sorry I could not be of anymore help, post back with the results if you will.
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Customer reply replied 3 years ago
So the dealer has the car still after 2 weeks. The ECU was swapped out and same thing was happening. The dealership is now following a possible short behind the dash or the gauge cluster. At least they were kind enough to provide us with a nice loaner car.
Lexus Mechanic: Ron, ASE Certified Technician replied 3 years ago
Hopefully they can find it. Sometimes electrical problem can be very difficult to nail down. Let me know how it works out.
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