2016-2022 Lexus RX350 & RX350L 3.5L V6 (2GR-FKS): Problems, Identification, and Used Replacement

Identifying the Correct 2GR-FKS Engine for Your RX350

The 2016-2022 Lexus RX350 and 2018-2022 RX350L use a specific 3.5L V6 engine from the Toyota GR family, identified by the engine code 2GR-FKS. This engine features a 60° V6 design with a die-cast aluminum block, dual overhead cam (DOHC) aluminum cylinder heads, and a D-4S fuel system, which combines both direct and port fuel injection. It was available in both front-wheel drive (FWD) and all-wheel drive (AWD) configurations.

How to Verify Your Vehicle's Engine

Before purchasing a replacement engine, you must confirm it is the correct version for your specific vehicle. Here’s how to verify the match:

• Check the VIN: The 5th digit of your vehicle's Vehicle Identification Number (VIN) must be 'Z'.
• Locate the Engine Code: The code '2GR' is stamped on the front-left side of the aluminum cylinder block, near the oil filter housing.
• Check for a Tow Package: Look near the oil filter housing for two metal lines that lead to a small, cylindrical engine oil cooler. If these lines are present, your vehicle has the factory tow package, and it requires a specific engine with provisions for this cooler. This article's assembly is for models without the tow package.

Critical Interchange and Fitment Differences

Not all 2GR-FKS engines are the same. Using an engine from a different model, even if it has the same code, will lead to significant installation problems.

• Other Toyota/Lexus Models: The 2GR-FKS engine is also used in vehicles like the Toyota Tacoma, Highlander, and Lexus GS350. However, these versions are not interchangeable with the RX350's engine. [14, 28] Differences in intake manifolds, engine computer (ECU) tuning for different octane fuels, and mounting points prevent a direct fit. [14, 22, 28] For example, the Tacoma's engine is mounted longitudinally for a rear-wheel-drive-based platform, while the RX350's is mounted transversely for a front-wheel-drive-based platform. [27]
• AWD vs. FWD: This engine fits both FWD and AWD models, but a critical parts swap is required for AWD installations.

Common Failure Symptoms

An engine may need to be replaced due to catastrophic failure. While some issues can be repaired, severe internal damage often makes replacement the most cost-effective solution. Watch for these signs:

• Engine Knocking: A deep, rhythmic knocking sound from inside the engine often points to worn or failed connecting rod bearings. [24, 31] This is a serious issue that can quickly lead to complete engine seizure.
• Excessive Smoke from Exhaust: The color of the smoke can help diagnose the problem. Bluish-grey smoke, especially during acceleration, suggests worn piston rings or valve seals are allowing oil to burn in the combustion chamber. [21] Continuous white smoke after the engine has warmed up can indicate a blown head gasket is allowing coolant to enter the cylinders. [21]
• Metal Shavings in Engine Oil: When changing the oil, check for metallic particles in the drained oil or on the magnetic drain plug. A significant amount of metal indicates severe internal wear on components like bearings, camshafts, or the crankshaft.
• Engine Seizure: In the most extreme cases, the engine will lock up and refuse to turn over. This is caused by a complete failure of internal rotating parts, often due to oil starvation or a broken component.

Diagnostic Flowchart

Known Problems, Recalls, and Technical Service Bulletins (TSBs)

While generally reliable, the 2GR-FKS engine has several documented issues. Before replacing an engine, check if a less severe problem is the actual cause of your symptoms.

Low-Pressure Fuel Pump Failure (Recall)

Document: NHTSA Campaign 20V682000 (Lexus Recall 20LA01). [2, 11]
Affected Years: 2017-2020 Lexus RX350, 2018-2020 Lexus RX350L. [2]
Issue: The in-tank low-pressure fuel pump can fail, which may cause the engine to stall while driving. [2, 11] This increases the risk of a crash. The remedy is to have a Lexus dealer replace the fuel pump assembly with an improved part, free of charge. [2, 36]

High-Pressure Fuel Pump Seepage (Customer Support Program)

Document: Lexus Customer Support Program 23LE03.
Affected Years: 2016-2022 RX350, 2018-2021 RX350L.
Issue: Some vehicles may experience a fuel odor from the engine bay, particularly at startup. [18] This can be caused by a small fuel leak from the high-pressure fuel pump. Under this program, a Lexus dealer will diagnose the issue and, if confirmed, replace the high-pressure fuel pump. [18]

Camshaft Housing / Cam Sensor Bolt Hole Oil Leak

Document: TSB L-SB-0027-18. [13]
Affected Years: 2016–2018 Lexus RX350. [13]
Issue: An oil leak may develop from the camshaft sensor bolt holes. [13] The repair requires removing the affected camshaft housing to replace gaskets and flange bolts. [13] This is a labor-intensive job.

Timing Chain Cover Oil Leak

Document: Community reports.
Affected Years: All years.
Issue: A common issue on the GR engine family is an oil leak from the timing chain cover. The factory-applied sealant can degrade over time, causing a significant leak. The repair is very expensive as it requires extensive labor.

Vacuum Pump Knocking Noise

Document: TSB L-SB-0060-23. [33]
Affected Years: 2016-2022 Lexus RX350. [33]
Issue: A knocking or ticking sound may be heard from the engine at idle. [33] This noise can be mistaken for a serious internal engine problem, but it may be coming from the vacuum pump located at the rear of the cylinder head. [33] A technician can confirm the source with a stethoscope. [33]

Replacement Cost Comparison

The cost of replacing a 2GR-FKS engine varies widely based on the type of replacement unit you choose. Labor costs are also significant due to the complexity of the job.

Installation: Key Considerations and Common Mistakes

Proper installation is critical for the long-term reliability of a replacement engine. This is an expert-level job that requires special tools and procedures.

Pre-Installation Checklist

Before the engine goes in the car, address these items while it's on an engine stand:

• Reseal the Timing Cover: Prevent a future multi-thousand-dollar repair by resealing the timing cover with Form-In-Place Gasket (FIPG) sealant.
• Replace the Water Pump: The water pump is a common wear item. Replacing it now is easy and provides peace of mind.
• Install New Seals & Gaskets: Always install a new rear main seal, front crankshaft seal, intake manifold gaskets, and exhaust manifold gaskets.
• Transfer Original Parts: You must reuse your original engine wiring harness, sensors, and fuel injectors. This ensures full compatibility with your vehicle's electronics. For AWD models, also transfer the upper oil pan and related brackets.

Installation Gotchas

• Subframe Removal: The engine and transmission are removed as a single unit by dropping the entire front subframe from the bottom of the vehicle. This requires an automotive lift and a subframe support cradle.
• Fragile Coolant Pipe: Be extremely careful with the plastic coolant bypass pipe located on the rear of the engine. It becomes brittle with age and is easily broken during installation.
• Crankshaft Position Sensor Relearn: After installation, the engine's computer must be recalibrated to the new crankshaft position sensor. This procedure, often called a "CKP Relearn," is mandatory for smooth operation and to prevent error codes. While some manual methods exist, using a professional diagnostic scan tool like Toyota's Techstream is the most reliable way to perform the relearn. [25, 34]

What Fails at Every Mileage Band

Under 60,000 Miles

Failures in this band are uncommon and often due to manufacturing defects rather than wear. Pre-2018 engines had a known issue with piston/cylinder wall scoring linked to oil control hole design, which can lead to oil consumption or catastrophic failure. The notorious timing chain cover oil seep can also begin as a minor weep at low mileage. Additionally, early production models (2016-2017) had reports of high-pressure fuel pump seepage (CSP 23LE03), and 2017-2020 models faced a low-pressure fuel pump recall (NHTSA 20V682000 / Lexus 20LA01).

• ✓Do during install (required): Reseal the timing chain cover using Form-In-Place Gasket (FIPG) sealant while the engine is on a stand. This prevents a future labor-intensive repair that requires engine removal.
• ✓Do during install (recommended): Replace spark plugs (the service interval is 60,000 miles). Replace the PCV valve to prevent crankcase pressure buildup. Inspect the water pump and plastic coolant bypass pipe for any signs of leaks.
• ✓Cheap insurance while the engine is out: For pre-2018 engines, perform a borescope inspection of cylinder walls to check for scoring before installation. Change engine oil with 0W-20 synthetic and replace the oil filter.

60,000 - 100,000 Miles

In this range, the timing cover seep present at lower mileage is more likely to develop into a noticeable drip that leaves stains on the ground. The original water pump is a common failure item and often begins to seep or fail within this mileage range if not preventatively replaced. While the D-4S dual injection system mitigates it, some carbon can accumulate on the intake valves, potentially causing a slightly rough idle.

• ✓Do during install (required): Replace the water pump and thermostat with new OEM parts. This is cheap insurance against engine overheating.
• ✓Do during install (recommended): Replace the serpentine drive belt. Replace intake manifold gaskets (upper and lower).
• ✓Cheap insurance while the engine is out: Consider a chemical intake valve cleaning (induction service) since the intake manifold is already removed for other service.

100,000 - 150,000 Miles

While the timing chain itself is designed for the life of the engine, tensioners and guides can be considered a wear item approaching 150,000 miles, especially under severe use. Some engines may begin to consume a noticeable amount of oil between changes due to normal wear on piston rings and valve seals. Beyond the timing cover, other seals and gaskets (valve covers, main seals) may begin to degrade and leak due to age.

• ✓Do during install (required): Replace front and rear crankshaft main seals.
• ✓Do during install (recommended): Proactively replace all accessible coolant hoses.
• ✓Cheap insurance while the engine is out: Strongly consider replacing the timing chain tensioners and guides as a preventative measure.

Over 150,000 Miles

The 2GR-FKS engine is widely regarded as having a very long service life, with many owners comfortably exceeding 200,000 to 250,000 miles with regular maintenance. Well-maintained examples have reached 300,000 miles. However, at this mileage, failures are less about specific design flaws and more about the natural end-of-life for various components like sensors, bearings, and seals. The engine's condition is highly dependent on its prior maintenance history.

• ✓Do during install (required): Complete timing service including the chain, all guides, and tensioners. Replace water pump, thermostat, serpentine belt, all seals (front/rear main), and all coolant hoses.
• ✓Do during install (recommended): A thorough inspection of the fuel system (injectors, pumps) and all sensors is highly recommended.
• ✓Cheap insurance while the engine is out: Replace any component or sensor showing signs of wear. Assume all standard wear-and-tear components require replacement.

Real Owner Experiences

The following table highlights real-world scenarios, failures, and costs reported by owners of vehicles equipped with the 2GR-FKS engine or its close relatives in the 2GR family.

Repair or Replace?

Deciding whether to repair your existing 2GR-FKS or replace it with a used OEM unit comes down to the severity of the failure and the economics of the repair.

• Timing Chain Cover Oil Leak: A typical repair cost ranges from $3,000 to $6,200+. Repair makes sense when the leak is significant (actively dripping) and the rest of the engine is in good health. Many owners report living with a minor seep for tens of thousands of miles.
• Head Gasket Leak: A typical repair cost ranges from $3,800 to $6,850+. Repair makes sense if the engine has not been severely overheated and there is no other internal damage (like warped heads or block). If cylinder heads also need replacement, the cost can exceed $5,300, making a used engine a more viable option.

Replacement is smarter when: Catastrophic failure occurs, such as a deep engine knock, piston failure, significant metal shavings in the oil, or warped heads/block from severe overheating. When the estimated cost of a specific repair approaches or exceeds the all-in cost of a lower-mileage used engine replacement (approximately $5,000 - $7,000 total for parts and labor), replacement offers better value. Used engine units typically run $2,100 - $3,400 for the part itself.

Questions to Ask Your Installer

• Have you worked on this specific 2GR-FKS engine before and are you familiar with dropping the subframe for removal?
• Will you be resealing the timing cover and replacing the water pump on the replacement engine while it is on the stand, before installation?
• What is your process for the Crankshaft Position (CKP) sensor relearn procedure?
• Are you using new, one-time-use high-pressure fuel lines and injector seals?
• If my vehicle is AWD, are you prepared to transfer my original upper oil pan and associated brackets?
• Does your labor quote include all required fluids, gaskets, and seals (e.g., 0W-20 oil, Toyota SLLC coolant, intake/exhaust gaskets)?
• Will you be transferring my original wiring harness, ECU, and all sensors to the replacement unit to ensure compatibility?

Freight, Delivery, and Pre-Purchase Verification

Buying a replacement engine is a major logistical purchase. A complete 3.5L V6 engine assembly weighs approximately 450 lbs and measures roughly 48" x 40" x 36" before crating. Because of this size and weight, it ships as LTL (Less Than Truckload) freight on a wooden pallet—never as a standard parcel.

Delivery requires a loading dock or a truck equipped with a liftgate. When the engine arrives, you or your shop must inspect the unit thoroughly before signing the delivery receipt. Look for any physical damage to the oil pan, valve covers, or sensors that may have occurred during transit.

Before you even place an order, perform a strict pre-purchase verification:

• Verify the 5th digit of your VIN is 'Z'.
• Check near the oil filter housing for two metal lines routing to a cylindrical cooler to confirm if the vehicle has a tow package.
• Confirm if your vehicle is FWD or AWD, as this dictates the parts you must swap from your old engine.

Arrival Inspection: Compression and Leak-Down Testing

Before installing your used engine, test its internal health. Perform a compression test or a cylinder leak-down test. A compression test measures the pressure built up inside each cylinder. For the 2GR-FKS, look for consistent readings across all six cylinders. A healthy engine should not have more than a 10% to 15% difference between the highest and lowest cylinders. A leak-down test pumps compressed air into the cylinder to see how much escapes. Good used engines should show less than 10% to 15% air leakage per cylinder.

Before the First Start: Fluids and Priming

You must install a new oil filter and fill the engine with fresh fluids before starting it. The 2GR-FKS requires 0W-20 full synthetic motor oil. You also need fresh engine coolant. Use Toyota Super Long Life Coolant (often called "Toyota Pink") or an exact equivalent. Do not reuse old fluids.

Before you actually start the engine, you must prime the oil system. Priming means pumping oil through the engine to coat the moving parts before they spin at high speeds.

1. Fill the engine with the correct amount of 0W-20 oil.
2. Disable the fuel and ignition systems. You can do this by removing the fuel pump relay and the ignition coil fuses.
3. Crank the engine with the starter motor for 10 to 15 seconds. Do not let the engine start.
4. Wait 30 seconds to let the starter motor cool down.
5. Repeat this cranking process two or three times until the oil pressure warning light turns off on the dashboard.
6. Reinstall the relays and fuses, then start the engine normally.

Frequently Asked Questions (FAQ)