Hyundai Sonata

The belt-driven water pump on the 2.7L V6 leaks at the shaft seal. If it leaks onto the timing belt, immediate belt failure follows. Preventive replacement at every timing belt service is mandatory.

Symptoms: Coolant loss with no visible external leak, overheating, coolant staining in the timing belt area.

The G6BA/G6DB is an interference engine with a timing belt. Belt failure inevitably causes bent valves and often connecting rod damage. The 90,000 km / 6-year service interval is frequently exceeded.

Symptoms: Sudden engine stall without warning, no restart possible, metallic noise when cranking.

The Lambda 3.3 V6 can show elevated oil consumption at high mileages through valve stem seal and piston ring wear. Regular oil level checks are important.

Symptoms: Blue smoke on startup, dropping oil level, faint oil smell.

The camshaft seals on the G6DB harden and lose their sealing ability from around 120,000 km. Oil reaches the timing belt, which can cause belt failure and engine damage.

Symptoms: Oil spots in the belt area, oil smell from the engine bay, timing belt noise when oil-contaminated.

The 3.3L Lambda MPI (G6DB) shows typical elevated oil consumption from sticking piston rings at higher mileages. Excessively long oil change intervals significantly accelerate the problem.

Symptoms: Oil consumption above 0.5 l/1,000 km, blue smoke, dropping oil level without visible leaks

The Mitsubishi F4A42 automatic transmission in the Sonata NF is known for reverse gear failures. Clutch packs and solenoids wear, requiring a full transmission overhaul. Cost: 2,500–3,000 euros.

Electrical short circuit in the ABS/VDC control unit can cause an engine compartment fire even when the vehicle is switched off. RAPEX notification A12/0367/18 from March 2018.

Insufficient corrosion protection on the rear axle crossmembers leads to perforation. Can suddenly alter rear wheel alignment and impair handling. RAPEX notification A12/0243/15.

Rear axle control arms can detach and suddenly alter rear wheel alignment, leading to dangerous handling. Recall for affected vehicles.

Faulty ABS wheel speed sensors trigger permanent ABS and ESC warning lights. Fault codes point to individual wheel sensors. Repair is straightforward and inexpensive.

The Sonata NF is now 15–20 years old — radiator, thermostat and coolant hoses should be treated as consumable items. On an 8-year-old example in 2013, cavity sealing was discussed in owner communities as an urgent topic.

On the Sonata NF, cavity protection is strongly recommended once the vehicle is 8+ years old. Without treatment underbody panels and cavities rust significantly — especially in salt-belt regions.

The Sonata NF alternator is a weak point at high mileages. Early signs are battery warning light and low charge state on night drives.

Trunk and underbody rust significantly with inadequate maintenance. Cavity wax treatment is strongly recommended as a preventive measure. Particularly imported vehicles are affected.