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Old 06-15-2021, 10:20 PM   #1
LadonP
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Exclamation Need Help!

I'm new to cars and my 2013 scion fr-s keeps showing a U0100 and a U0102 code. I was wondering if anyone had any tips on troubleshooting these codes? My car also stalls during idle after running for a little bit and sometimes when I go in reverse?. Any advice would be greatly appreciated.
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Old 06-16-2021, 12:56 PM   #2
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I'm new to cars and my 2013 scion fr-s keeps showing a U0100 and a U0102 code. I was wondering if anyone had any tips on troubleshooting these codes? My car also stalls during idle after running for a little bit and sometimes when I go in reverse?. Any advice would be greatly appreciated.
Hi ya, there, LandonP and welcome to our forum -

First off, I'd suggest you check the battery and make sure it's up to the proper voltage.

If it isn't, charge it up or replace it.

If it's OK, I suggest you take your car to a shop and ask them to fix it.

Maybe some DIY -ers will be along to address your cars problem.
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Old 06-16-2021, 01:00 PM   #3
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Is the car stock? If not what mods? Did anybody do work in the engine bay or under the dash?
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Old 06-16-2021, 01:10 PM   #4
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You didn't happen to have installed an ebay 4th brake light did you?
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Old 06-16-2021, 01:11 PM   #5
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Need Help!

UXXXXX codes point to a communication fault, not a problem with the actual engine or body control systems.

Is anything plugged into the OBD port?
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Old 06-16-2021, 01:14 PM   #6
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UXXXXX codes point to a communication fault, not a problem with the actual engine or body control systems.

Is anything plugged into the OBD port?
Is the ECU screwed on proerly so it is grounded?
Was some weird and wonderful product hooked up to it and screwed something up?
Did somebody try to throw a homemade "tune" on?
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