Two problems related to automatic emergency braking have been reported for the 2021 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 Subaru Legacy based on all problems reported for the 2021 Legacy.
The car's aeb system keeps mistaking steam from the street (such as sewer covers or construction sites) for a physical object and will activate. It has stopped my car in the middle of the street two days ago (5/31/22) and I was almost rear-ended by the car behind me. The warning system will also engage for no reason in most city driving conditions when there is no danger. It mistakes merging with cars with an imminent crash. I do not trust the system and now disable it whenever I drive as it is more likely to cause an accident than to prevent one. This has been a problem since I purchased the car. I contacted the dealer on 5/31/22 but have not heard back.
There seems to be an issue with the infotainment system. The system will randomly turn off which also turns off the safety features. I would like to associate this while carplay is in use, but I have witnessed it happen without carplay. Subaru has already replaced the head unit under warranty, but the problem continues. For the cost of the car, this should not be an issue.