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A p0420 definitely doesn t stop LTFT
Only certain dtc's i believe
It may or may not, depends on the case
i had a damaged primary o2 sensor which went a lot leaner (its 14.7 would be a 20-21 of real afr when warm) and the ecu wasn't happy of something during the cold start so it delayed LTFT
while LTFT was delayes, fuel trims were limited to "only" -35% or so
when ltft activated suddenly the trims went -80% and the car was extremely lean
Cold start has a "fuel system status" of 1
So if something messes with the cold start conditions and fuel system status stucks at 1 , ltft doesn't start
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