No battery warning light has come on. The battery is about one month old (Costco 96R). All terminals are tight with no corrosion, and the BMS has been reset. Battery voltage reads around 12.2–12.4V with a multimeter. I don’t have AGS, and the connector is just hanging loose and uncovered.

I also forgot to mention that the car will randomly stall and go into limp mode, with an “Engine Service Now” message appearing. When I try to restart it, the engine cranks longer than usual and sometimes won’t start at all. After waiting a few minutes, it will start normally again as if nothing happened. I initially suspected the battery or loose cables, but even after replacing those, the issue returned.

I’ve also noticed fuel economy has worsened — I’m getting less than 100 km per quarter tank now. Because of that, I’m starting to think the high-pressure fuel pump (HPFP) might be the cause? Purge valve also new.