Kia Forte LXS / FE / EX IVT
Two-litre naturally aspirated engine from the Nu family without direct injection — therefore no GDI-typical carbonisation issues. Fundamentally robust, but higher mileages (from approx. 100,000 km) reveal weaknesses in piston rings and oil consumption. Kia has issued TSB ENG222 for oil burning. Regular oil level checks and short oil change intervals (max. 10,000 km) are essential.
IVT: seamless shifting with a reliability caveat
The IVT in the Forte BD 2.0 saves fuel but is prone to early belt failures in early model years. Any buyer should check the recall service history before purchase.
Engine Weaknesses 7
The oil control rings can become stuck in the ring grooves by carbon deposits and lose their sealing function. Oil enters the combustion chamber and burns, sometimes without visible blue smoke. Kia issued TSB ENG222 specifically for this defect.
Symptoms: Oil level drops noticeably between changes (>0.5 L/1,000 km), occasional brief blue smoke on cold start, engine oil warning light
The G4NA's oil control rings become gummed up by carbon deposits and stop scraping oil from the cylinder walls. The engine then burns significant quantities of oil. Under the Kia Engine II Settlement, extended warranty up to 15 years/150,000 km with a complete service history.
Symptoms: Blue smoke on cold start or overrun, oil level drops between service intervals, fault code P0420 (catalyst efficiency).
Metal swarf from crankshaft manufacture blocks the oil bores of the connecting rod bearings and causes premature bearing wear through to engine failure. Affected models: Sorento XM 2.4 MPI, Sportage, Optima 2.0 GDI (2011–2015). Worldwide recall, 295,000 vehicles.
Symptoms: Knocking from the engine block, oil pressure warning flashing, engine warning light flashing continuously (engine protection mode active), power reduction.
The hydraulic chain tensioner loses its clamping force at higher mileages. The timing chain strikes the guide rails on cold start. With continued operation there is a risk of chain skip and valve damage. Regular oil changes significantly extend service life.
Symptoms: Metallic rattling or clattering from the engine bay for 5–30 seconds on cold start, disappears after warm-up
The mechanical water pump of the G4NA shows an elevated failure rate from around 100,000 km. Leaks at the shaft seal lead to coolant loss and risk of overheating. Seals and coolant hoses are also critical.
Symptoms: Coolant level drops without visible external leak, temperature gauge rises unusually, puddles under the vehicle with a sweet smell
When piston rings allow oil through, oil ash poisons the catalyst. The substrate clogs or overheats from post-combustion of fuel. The result is misfires, power loss and an engine fault warning. Typical from 80,000 km on vehicles with oil consumption.
Symptoms: Engine warning light (P0420 cat efficiency), power loss, rough running, occasional sulphur smell
Through the G4NA's high oil consumption, burnt oil coats the catalytic converter substrate and reduces its efficiency. With continued operation the exhaust backpressure rises and engine power drops further.
Symptoms: Fault code P0420 (catalyst efficiency below threshold), increased fuel consumption, sulphurous-metallic exhaust smell.
Vehicle Weaknesses 6
NHTSA recall 21V-259 / SC217 covers 147,249 Forte BD 2019–2021 vehicles with the 2.0L Nu MPi engine: an inconsistent heat-treating process at the piston ring supplier produced rings that are too hard, causing them to shatter, score cylinder walls, and lead to oil consumption and engine stall. Dealers replace the entire engine at no charge when the defect is confirmed.
Forte BD 2019–2021 models without UVO connectivity are a well-known target of the 'Kia Boys' theft wave in the US. The missing electronic immobilizer made theft possible in under 90 seconds. Kia offers a free anti-theft software update.
Forte BD 2019–2022 with the IVT (continuously variable transmission) shows early transmission failures: belt breakage, slipping, and sudden loss of drive are the most common complaints in NHTSA data. Repair costs are typically $2,000–$5,000; full transmission replacement in severe cases.
NHTSA recall 21V-164 covers Forte BD 2020–2022: the OCS/ODS system may fail to detect a child restraint seat in the front passenger seat and not suppress the airbag as required. Dealers inspect and replace the system at no charge.
NHTSA recall 20V-459 covers Forte BD 2019: the left front axle driveshaft may not have been heat-treated and can break, causing sudden loss of drive power. Dealers inspect and replace the axle shaft at no charge.
Forte BD 2021 shows an above-average rate of cylinder misfires, primarily on cylinder 4 (DTC P0304). Faulty spark plugs or ignition coils are the most common cause; repair costs around $800. NHTSA records 14 engine complaints for 2021.
