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  #1  
Old 11-08-2019, 05:25 PM
Arcturus Arcturus is offline
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Join Date: Oct 2019
Posts: 8
Mein Auto:
2016 328i - MIL Light

Hello,

I've been noticing that the engine is taking quite a lot of time to get up to temperature and today I got my first MIL code. I just bought this car a week ago, fun!

I used my scan tool and found:

U1408 - O2 sensor
P0128 - Coolant Thermostat Below Temp

Are these codes related?

Does a bad t-stat cause U1408?
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  #2  
Old 11-08-2019, 05:59 PM
Ziggy328xi Ziggy328xi is offline
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Location: Boston MA
 
Join Date: Sep 2018
Posts: 376
Mein Auto: 11 328xi N51
id start with a thermostat, as if engines not warming up fast enough it can trigger o2 faults, rarely but can
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