Most Common Car Issues

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Model
Sonata

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MOST COMMON PROBLEMS

HYUNDAI Sonata 2016

The 2016 Hyundai Sonata is a sleek sedan powered by a 2.4L inline-4 engine with DOHC GDI THETA-II technology. It features comprehensive safety with air bags for the 1st and 2nd rows, including side and curtain air bags. This model is equipped with a direct TPMS and Stoichiometric Gasoline Direct Injection for efficient fuel management. Assembled in Alabama, it's a reliable choice for those seeking a balanced blend of performance and safety.

Spec:

Engine Configuration
In-Line
Engine Model
DOHC GDI THETA-II
Engine Number of Cylinders
4

Problems:

Oil leaks
The Theta-II engine is known for oil leaks, often due to problems with the valve cover gasket or oil pan gasket.
Engine stalling
Some owners report engine stalling issues, which could be due to a faulty crankshaft position sensor or issues with the fuel system.
Timing chain problems
The engine may experience timing chain tensioner problems, leading to a noisy engine and potential timing chain failure.
Excessive oil consumption
This engine is known for excessive oil consumption, often due to piston ring wear or other internal engine components.
Carbon buildup
Direct injection engines like the Theta-II GDI can suffer from carbon buildup on intake valves, leading to performance issues and rough idling.
Knocking noise
Some engines develop knocking noises due to connecting rod bearing wear or issues with the fuel injection system.
Overheating
Cooling system issues, such as a failing water pump or thermostat, can cause the engine to overheat.
Engine misfire
Misfiring can occur due to faulty ignition coils, spark plugs, or fuel injectors.
HYUNDAI Sonata 2017

The 2017 Hyundai Sonata is a sleek, left-hand drive sedan with a robust 2.4L GDI Theta-II engine producing 187 hp. This five-seater offers a comfortable ride, equipped with standard features like Dynamic Brake Support (DBS), ABS, a backup camera, and Electronic Stability Control (ESC). Safety is a priority with front, side, and curtain airbags for both rows. Priced at $21,950, this model boasts a top speed of 130 MPH and is manufactured in Montgomery, Alabama.

Spec:

Dynamic Brake Support (DBS)
Standard
Engine Brake (hp) From
187
Engine Manufacturer
HMC
Engine Number of Cylinders
4
Other Engine Info
GDI, THETA-II

Problems:

Engine knocking
Engine knocking in Hyundai Sonata vehicles, especially with the Theta-II engine, is a known issue. It is often caused by irregular combustion, which can be due to poor fuel quality, carbon buildup, or faulty components.
Oil consumption
Excessive oil consumption has been reported in some 2017 Hyundai Sonata models. This can be due to worn piston rings or valve seals, leading to decreased engine performance and potential engine damage.
Engine stalling
Some drivers have experienced unexpected engine stalling, which can be due to issues with the fuel delivery system, a faulty crankshaft position sensor, or problems with the engine control unit (ECU).
Timing chain problems
The Theta-II engine has been known to have issues with the timing chain tensioner, which can lead to improper timing chain operation, causing noise, reduced performance, and potential engine damage.
Fuel injector issues
Fuel injector clogging or failure can result in poor engine performance, misfires, and reduced fuel economy. This is particularly a concern in direct injection engines like the GDI used in the Sonata.
Knock sensor issues
Faulty knock sensors can lead to improper engine timing adjustments, resulting in knocking or pinging sounds and potential engine damage if not addressed.
Cooling system failures
Problems with the cooling system, such as a faulty thermostat or water pump, can lead to engine overheating, which can cause significant engine damage if not resolved promptly.
HYUNDAI Sonata 2015

The 2015 Hyundai Sonata is a four-door sedan powered by a 2.4L DOHC GDI Theta-II engine. It features curtain airbags in the 1st and 2nd rows, and front and side airbags for the driver and passenger. This model is known for its Stoichiometric Gasoline Direct Injection and has a gross vehicle weight rating of up to 6,000 lbs. Manufactured in Alabama, USA, it belongs to the SE and ECO series.

Spec:

Engine Model
DOHC GDI THETA-II

Problems:

Connecting rod bearings failure
Premature wear of the connecting rod bearings, which can lead to engine knocking and eventually engine failure.
Excessive oil consumption
The engine may burn oil at a higher rate than normal, leading to low oil levels and potential engine damage if not monitored.
Timing chain issues
Problems with the timing chain tensioner or guides can cause timing chain slack, leading to poor engine performance or even catastrophic engine damage.
Carbon build-up
Direct injection engines like the GDI can suffer from carbon build-up on intake valves, leading to reduced performance and fuel efficiency.
Engine stalling
Random stalling or rough idling, often attributed to issues with the fuel system or electronic control unit (ECU).
Cooling system failures
Problems with the radiator, water pump, or thermostat can cause overheating, which can severely damage the engine.
Piston ring wear
Worn piston rings can lead to compression loss, oil blow-by, and decreased engine efficiency.
Engine misfires
Faulty ignition coils, spark plugs, or fuel injectors can cause engine misfires, leading to reduced performance and potential engine damage if not addressed.
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