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well, take care of the speed sensor issue,
then do a ABS Module relearn with Forscan and it will fix the U3000 DTC codes
 

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I had these come up on my 2016 Mazda 3 randomly and had varying reasons from Mazda ( which I do believe their mechanic thought was true )at first, but thankfully I persisisted and the guys at the dealership realised I wasn't a knobhead and had sound mechanical knowledge with 25 years experience building and maintaining military and civil aircraft. Had found a couple of potential different causes on this forum including the brake sender unit and maybe the abs wheel speed sensor but mine ended up being a carbon buildup due to a bad/faulty O2 sensor which in turn caused the inlet valves to not close/operate correctly. My freeze frame data was very similar to yours where i was at low revs then tp% was very high as I was trying to accelerate again which somehow sent unexpected maf and map sensor readings to what my ECU would expect with the conditions I was driving in. I caught mine just before my regular warranty expired and Mazda replaced the O2 sensor and carbon cleaned the engine, just over 2000 miles now with no errors!
 

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S Stefan... how old is your battery? Dying batteries can appear to be fine but they can cause endless electrical glitches...
 

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S Stefan... how old is your battery? Dying batteries can appear to be fine but they can cause endless electrical glitches...
Just over 3 years old now so I'd be surprised if that's faulty this early, plus as the i-stop works fine & it requires a good amount of charge to help operate it seems to indicate it's good. I never disregard advice though so thanks, if any of the errors start reoccurring I'll get the battery tested when fault finding.
 

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Your heads up display would have issues before i-stop if its the battery. Especially on cold start ups.

The ABS sensors do fail especially if you are near salt.
 

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Discussion Starter #8
S Stefan... how old is your battery? Dying batteries can appear to be fine but they can cause endless electrical glitches...
is the original battery (2014), ill change the battery and check the ABS sensor from the Left front wheel
 
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