2019 Hyundai Sonata: What to check before buying

Excessive oil consumption dominates, with engines losing a quart every 600 to 1,000 miles and no visible leaks. Some run nearly dry, which triggers the low oil light or limp mode. Most cases surface between 75,000 and 90,000 miles, though some start earlier. Dealers require paid oil consumption tests and combustion cleanings before approving a new engine. Second owners report denied claims because the powertrain warranty does not transfer. Two complaints describe fires in the engine compartment, and one describes burns from the rear exhaust tip.

Excessive oil consumption appears again, with oil needed as often as every 10 days. Owners also report knocking or rattling from the front and an intermittent check engine light. Combustion cleaning does not always stop the loss. Dealers point to leaking gaskets or an internal leak. A gasket replacement fixed a hard-start problem at 23,000 miles. One fire report describes smoke, a burning oil smell, and flames from under the hood before the car stalled and burned at 60,000 miles.

Low-beam headlights cast dark voids on the road, usually two half-circle blackout spots below a sharp cutoff line. Pedestrians and lane edges can disappear inside these gaps. Other drivers say the low beams are dim and too short for highway speeds. The problem shows up on the first night drive. Dealer adjustments rarely help, raising the aim blinds oncoming drivers, and dealers often say the lights meet specification. Several drivers describe near misses with pedestrians or swerving at shadows.

The hybrid system shuts down while driving. Power steering and throttle cut out, every warning light comes on, and the car drops into limp mode. Other reports describe no-start mornings with a hard brake pedal, a car that locks itself in park with a frozen steering wheel, an airbag light traced to a short, and a blind-spot warning that stops working. Dealers often cannot reproduce the faults. One fire report describes flames after pressing the start button. Thefts using a USB cable also appear.

Airbags fail to deploy in serious front and side collisions, including crashes that totaled the car. Drivers report broken ribs, a concussion, and neck injuries. Four complaints are crash-related, with three injuries. The opposite failure also appears: driver front and side airbags firing over a speed bump at low speed. Other reports describe an airbag warning light that flickers with seat belt movement or reacts to a cushion on the passenger seat.

Oil consumption shows up again here, with owners adding a quart every 500 to 700 miles. Engines need replacement after sludge, a burnt valve, or a snapped piston. Symptoms include hesitation from a stop and at highway speed, stalling, violent shaking, and rod knock. Dealers require repeated oil consumption tests before approving repairs. Hybrid cars report a sudden system warning, lurching, and power loss on the highway. A transmission whine at 35 to 40 mph also persists through 3 replacements.

Paint peels, bubbles, and flakes off the hood, roof, and trunk, mostly on white cars. Peeling can start within 2 months of purchase. Owners point to a warranty extension that covered the same problem on 2017 and 2018 models but leaves out 2019. Second owners report being denied coverage. One complaint pairs the paint failure with heavy oil consumption. These failures are cosmetic, and none of these reports involve a crash or injury.

Power steering cuts out at highway speed, making the car hard to steer. Repeated repairs to the steering control unit, sensors, and wiring harness do not always fix it. Other reports describe the wheel sticking off center, a dead spot, uneven tire wear, and a grinding noise when turning. The single crash-flagged complaint describes a theft in which the steering column was broken to start the car. With only 4 complaints the pattern is thin, though losing assist at speed is a real control risk.

The driver seat belt fails to retract, and the latch can pop loose. In one crash the belt did not hold, and the driver hit the dashboard and suffered whiplash and leg injuries. The replacement belt still did not latch properly. On a car past 60,000 miles, the dealer quoted about $1,800 to $2,000 to replace the pretensioners and latch. There are only 2 complaints, and both involve the driver side belt.