1.6L Engine Long Block Assembly for 2018-2019 Hyundai Sonata
Product Notes Read before buying
This is a 1.6L turbocharged engine assembly for the Hyundai Sonata. To ensure compatibility, your vehicle's 8th VIN digit must be 'A'. This engine is for vehicles with an automatic transmission and built for the US market. Please note that this is a long block assembly and does not include the turbocharger unit or exhaust manifold.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 2018 - 2019 |
Know This Engine Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this engine family:
A quick look at your own vehicle makes sure the right engine shows up:
- Verify your VIN's 8th Digit is 'A'
- Locate the Engine Code Stamp on the front of the engine block to confirm it begins with 'G4FJ'
- Confirm Transmission Type (7-speed Dual-Clutch automatic)
- Confirm FWD drivetrain configuration
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine hoist/crane
- Load leveler
- Torque wrench
- Fuel line disconnect tools
- Bi-directional scan tool
- Hyundai engine support fixtures (09200-L1100-01, 09200-L1200-01)
Budget for these consumables at install:
- Engine oil (5W-30 or 5W-40 full synthetic)
- OEM Hyundai/Kia oil filter
- OE-spec ethylene glycol-based phosphate coolant
- NGK Iridium spark plugs (pre-gapped to 0.028"–0.030")
- Intake manifold gasket
- Exhaust manifold gasket
- Valve cover gasket
- High-pressure fuel injector seals/O-rings
- One-time-use metal high-pressure fuel line
- Rear main seal
- Thermostat and gasket
- Serpentine drive belt
What your vehicle’s computers will need after the swap:
What’s involved: Crankshaft Position (CKP) Sensor Relearn and Engine Control Module (ECM) adaptive value reset
sources differ: Arm 1 states a CKP sensor relearn and ECM adaptive value reset are required using a dealer-level or high-end bi-directional scan tool to prevent misfires or starting issues. Arm 2 states no programming or dealer scan tool is required for a like-for-like swap, though basic throttle body relearns may be needed.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Turbocharger Contamination: If the original engine suffered bearing failure, metal debris was likely pumped through the turbocharger's oil supply lines. You must thoroughly flush or replace the turbocharger oil feed/drain lines and inspect the turbocharger itself.
- High-Pressure Fuel System Safety: The high-pressure fuel system operates at over 2,000 PSI. Relieve pressure before disconnecting. Always replace the metal high-pressure fuel line; do not attempt to reuse it.
- Torque-to-Yield (TTY) Bolts: Cylinder head bolts and the harmonic balancer bolt are torque-to-yield (stretch) fasteners and must be replaced with brand-new OEM bolts if loosened or removed.
- Timing Chain Tensioner: The timing chain tensioner must be properly retracted and locked with a pin before removing the timing chain.
- Accessory and Manifold Transfer: Transfer the intake and exhaust manifolds, wiring harness, and all accessories from the old engine. The valve cover may also need to be swapped to accommodate different engine cover mounting points.
- Carbon Cleaning: Since this is a used GDI engine with 42k miles, clean the intake ports and valves of carbon deposits while the engine is out of the vehicle.
Easy to get right once you know them:
- Reusing a Contaminated Turbocharger: Swapping the old turbo onto the new engine without realizing that the old engine's bearing failure sent metal shavings through the oil supply lines, which will destroy the new engine.
- Reusing the High-Pressure Fuel Line: Reusing the metal high-pressure fuel line which uses a crush-flare fitting that deforms upon initial torque, creating a severe fire hazard.
- Using Aftermarket Oil Filters: Using cheap aftermarket oil filters that lack the proper bypass valve stiffness, causing dry cold starts, timing chain rattle, and premature bearing wear.
- Not Resetting ECU Adaptives: Failing to clear the ECM's learned adaptive values, causing the ECU to run the new engine on the fuel trims of the old, worn-out engine.
- Ignoring Oil Leaks During Install: Failing to replace common leak-prone gaskets like the valve cover gasket and the rear main seal while the engine is on a stand.
- Not Priming the Oiling System: Failing to disable the fuel or ignition system and crank the engine to build oil pressure before starting it for the first time.
Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Hyundai introduced the Knock Sensor Detection System (KSDS) software update to monitor engine vibrations and trigger a flashing Check Engine Light (DTC P1326) and limp mode if wear is detected.
🔎 Recommended at install: Regular carbon cleaning (such as walnut blasting) every 100,000-120,000 miles. Constantly monitor oil levels to prevent oil starvation.
🔎 Recommended at install: Replace the camshaft-driven high-pressure fuel pump if internal seals fail to prevent raw gasoline from diluting engine oil.
🔎 Recommended at install: Replace the valve cover gasket and the turbo oil feed line.
🔎 Recommended at install: Replace worn purge control system check valve.
Researched from factory recalls, TSBs and OEM service data (reference unit 300-10196-5064224). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2018-2019 Hyundai Sonata 1.6L Gamma II T-GDI: Problems, Identification, and Used Replacement
Identify the G4FJ engine, understand its common bearing and oil consumption failures, and learn when to swap in a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
25 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Hyundai: 199N1-2BU03, 199N12BU00, 199N12BU01, 199N12BU02, 199N12BU03, G4FJ
Fits Years: 2018 2019
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