The 2019 Volvo S90 PHEV is a reliable option among used hybrid cars, as Volvo’s PHEV systems have demonstrated solid long-term reliability with no widespread critical issues reported. For anyone looking to buy used cars, it’s important to note that the high-voltage battery often retains factory warranty coverage for early-model units; for out-of-warranty vehicles, battery replacement is a significant maintenance cost to consider, estimated at $5,000-$8,000. Routine maintenance focuses on hybrid system software updates and electrical component inspections, with overall service costs comparable to traditional luxury sedans. Proper charging habits (avoiding frequent deep discharges) can extend battery lifespan to over 150,000 km, adding to the model’s appeal as a durable choice in the used car market.