20 Engine parts are listed for the 2024 Lexus ES300H, in 11 part types, covering the 2.5L L4 ELECTRIC/GAS engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2024 Lexus ES300H, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. Most of the listed parts are Conversion / Lower Gasket Set (2 parts), Crankshaft Main Bearing (2 parts) and Crankshaft Seal (2 parts). The other 8 part types cover the remaining 14 parts.
The 2024 Lexus ES300H came with a single engine, the 2.5L L4 ELECTRIC/GAS, and every part is verified against it.
6 brands supply engine parts for the 2024 Lexus ES300H, led by TOPLINE (8 parts), AJUSA (7 parts) and TECHPRO (2 parts), plus 3 more brands.
Each part number listed for the 2024 Lexus ES300H opens a page with every vehicle that part fits.
Connecting Rod Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOPLINE | RBTO59 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
One part is listed for the 2024 Lexus ES300H — TOPLINE RBTO59.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 54307700 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TOPLINE | CBSTO59 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
2 Conversion / Lower Gasket Set parts are listed for the 2024 Lexus ES300H, from AJUSA and TOPLINE.
Part numbers include AJUSA 54307700 and TOPLINE CBSTO59.
Crankshaft Main Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOPLINE | TWTO59 | 🇺🇸 US 🇨🇦 CA | Thrust Bearing | View on Amazon |
| TOPLINE | MBTO59 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
2 Crankshaft Main Bearing parts for the 2024 Lexus ES300H come from TOPLINE.
Part numbers include TOPLINE TWTO59 and TOPLINE MBTO59.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 15121900 | 🇺🇸 US 🇨🇦 CA | FrontClockwise | View on Amazon |
| AJUSA | 15092800 | 🇺🇸 US 🇨🇦 CA | RearCounter Clockwise | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
2 Crankshaft Seal parts for the 2024 Lexus ES300H come from AJUSA.
Listed part numbers: AJUSA 15121900 and AJUSA 15092800.
Cylinder Head Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 81078800 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TOPLINE | HBTO59 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the bolts that clamp the cylinder head to the block.
2 Cylinder Head Bolt parts are listed for the 2024 Lexus ES300H, from AJUSA and TOPLINE.
Listed part numbers: AJUSA 81078800 and TOPLINE HBTO59.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 10251200 | 🇺🇸 US 🇨🇦 CA | Multi Layered Steel | View on Amazon |
| MAHLE / CLEVITE | 55502 | 🇺🇸 US 🇨🇦 CA | Multi-Layered Steel | View on Amazon |
This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
2 Cylinder Head Gasket parts are listed for the 2024 Lexus ES300H, from AJUSA and MAHLE / CLEVITE.
Part numbers include AJUSA 10251200 and MAHLE / CLEVITE 55502.
Cylinder Head Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 52570500 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TOPLINE | HSTO59 | 🇺🇸 US 🇨🇦 CA | Includes Valve Stem Seals | View on Amazon |
This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
2 Cylinder Head Gasket Set parts are listed for the 2024 Lexus ES300H, from AJUSA and TOPLINE.
This group includes AJUSA 52570500 and TOPLINE HSTO59.
Engine Cover
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TECHPRO | LX1228174 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Lower | View on Amazon |
| TECHPRO | LX1228163 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LowerPE/Vacuum Form | View on Amazon |
This table covers the Engine covers.
TECHPRO supplies both parts for the 2024 Lexus ES300H.
This group includes TECHPRO LX1228174 and TECHPRO LX1228163.
Engine Kit Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 50522800 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TOPLINE | CGSTO59 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
2 Engine Kit Gasket Set parts are listed for the 2024 Lexus ES300H, from AJUSA and TOPLINE.
Part numbers include AJUSA 50522800 and TOPLINE CGSTO59.
Exhaust Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOPLINE | EVTO59 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
This group shows a single part: TOPLINE EVTO59.
Harmonic Balancer
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | 102224 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| PIONEER | DA2224 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the crankshaft pulleys / harmonic balancers at the front of the engine.
2 Harmonic Balancer parts are listed for the 2024 Lexus ES300H, from ATP and PIONEER.
Listed part numbers: ATP 102224 and PIONEER DA2224.
Buying Engine Parts for a 2024 Lexus ES300H
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Confirm you have the 2.5L L4 ELECTRIC/GAS engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Conversion / Lower Gasket Set and Crankshaft Main Bearing .
Frequently Asked Questions
How many engine parts fit the 2024 Lexus ES300H?
Our catalog currently lists 20 engine parts for the 2024 Lexus ES300H across 11 subcategories and 6 brands, covering the 2.5L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of engine problems on a 2024 Lexus ES300H?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2024 Lexus ES300H was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2024 Lexus ES300H?
Every part on this page is matched to the 2.5L L4 ELECTRIC/GAS engine. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2024 Lexus ES300H
Engine Parts for Other Lexus ES300H Years
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