LEXUS 89457-30140 Engine Motor Throttle Body Sensor UCF20L 1UZFE 4.0L

( Manufacturer Part Number: 89457-30140 ), ( Type: Throttle Body ), ( Manufacturer Warranty: 3 Months ), ( Country Of Origin: Japan )

Review LEXUS 4.0l Engine Motor Throttle Body Sensor Oem fits LS400 1998–2000

The **Lexus 89457-30140 UCF20L Throttle Body Sensor** is a precision-engineered component designed exclusively for the **1UZ-FE 4.0L V8 gasoline engine** found in Lexus LS 400 models produced between **1998 and 2000**. This sensor is a critical part of the engine s electronic throttle control system, responsible for monitoring and regulating airflow through the throttle body to optimize engine performance, fuel efficiency, and emissions compliance. Crafted with Lexus signature attention to detail, the UCF20L throttle body sensor integrates seamlessly with the engine s **Multiport Fuel Injection (MFI) system**, ensuring accurate throttle position feedback to the Engine Control Module (ECM). The sensor features a robust, corrosion-resistant design, incorporating high-quality materials to withstand the demanding conditions of high-performance driving, including rapid throttle responses and sustained high RPM operation. Its precise calibration allows for smooth, responsive acceleration while minimizing engine lag, contributing to the LS 400 s renowned blend of luxury and power. Whether restoring a classic Lexus to its original glory or upgrading an existing system for enhanced reliability, this OEM-spec throttle body sensor delivers the performance and durability expected from Lexus engineering. Perfect for mechanics, restoration enthusiasts, or owners seeking authentic replacement parts, it ensures compatibility with the engine s electronic systems, maintaining optimal throttle response and engine efficiency.

### **Pros and Cons of Buying a Lexus LS400 (1998-2000, 4.0L UCF20L 1UZ-FE Engine, Throttle Body Sensor Issue: 89457-30140)**

#### **Pros**

1. **Reliability and Durability**

The 1UZ-FE 4.0L V8 engine is one of Lexus most robust powerplants, known for longevity when properly maintained. Many examples easily exceed 200,000 miles with basic upkeep. The LS400 s solid-state electronics and mechanical simplicity contribute to its reputation for dependability, especially compared to competitors of the era.

2. **Luxury and Comfort**

The LS400 was Lexus flagship sedan, offering a refined, quiet cabin with premium materials, excellent sound insulation, and a smooth ride. The adaptive suspension (on later models) and high-quality interior make it a comfortable long-term vehicle, even by modern standards.

3. **Performance and Driving Dynamics**

The 4.0L V8 produces **288 hp (SAE net)** and **282 lb-ft of torque**, delivering strong acceleration and a smooth power delivery. The manual transmission (if available) or smooth automatic (U341E) provides engaging driving dynamics. The LS400 handles well for its size, with precise steering and a balanced chassis.

4. **Resale Value and Prestige**

Lexus vehicles, especially the LS400, hold their value exceptionally well. The brand s reputation for reliability and luxury ensures that even older examples retain significant resale worth. Owning a LS400 carries prestige, appealing to enthusiasts who appreciate Japanese engineering and understated elegance.

5. **Low Maintenance Costs (Compared to American Luxury Brands)**

While not immune to wear, the LS400 s mechanical simplicity and availability of parts (especially in the U.S. and Europe) keep maintenance costs lower than those of German or American luxury rivals. Routine services like oil changes, timing belt replacements (if needed), and basic tune-ups are straightforward and affordable.

6. **Availability of Parts and Aftermarket Support**

The 1UZ-FE engine is one of the most supported V8s in the aftermarket. Parts for the throttle body sensor (89457-30140) and other components are widely available, and tuning options (e.g., cold air intakes, exhaust upgrades) can enhance performance without major modifications.

7. **Fuel Efficiency for a V8 (By Era Standards)**

While not a hybrid, the LS400 achieved **16-18 MPG city / 22-25 MPG highway** in its day, which was respectable for a V8 sedan. Modern fuel economy standards are higher, but the LS400 remains efficient for its class and era.

8. **Timing Chain (No Belt Replacement Needed)**

Unlike many engines of the era, the 1UZ-FE uses a **timing chain**, eliminating the need for costly and frequent timing belt replacements. This reduces long-term maintenance hassles.

---

#### **Cons**

1. **Throttle Body Sensor Issue (89457-30140)**

The **throttle body sensor (TBC) or throttle position sensor (TPS) failure** is a well-documented issue in the 1UZ-FE engine, particularly in the **1998-2000 LS400 models**. Symptoms include:

- Rough idle or stalling

- Hesitation or poor acceleration

- Check Engine Light (OBD-II codes P0120, P0121, P0122, or P0123)

- The sensor may become stuck open or closed, leading to drivability problems.

- **Fix:** Replacement is relatively inexpensive ( $100-$200 for parts labor), but the sensor may fail again if the throttle body itself is dirty or worn. Cleaning the throttle body and replacing the sensor can resolve the issue, but some owners report recurring problems if the underlying cause (e.g., carbon buildup) isn t addressed.

2. **Aging Electronics and Infotainment**

The LS400 s infotainment system is **basic by modern standards**, featuring a single CD player (no Bluetooth, USB, or navigation). The climate control and power accessories (windows, seats) are functional but lack the sophistication of today s luxury vehicles. Some owners may find the lack of modern connectivity frustrating.

3. **Fuel Economy Limitations**

While decent for a V8 of its time, the LS400 s fuel efficiency is **not competitive with modern hybrids or smaller engines**. Expect to spend more on gas than in a modern luxury sedan or even a smaller V6.

4. **Weight and Handling**

The LS400 is a **heavy vehicle** (around **3,800-4,000 lbs**), which can make it feel sluggish in city driving or tight parking situations. While the suspension is comfortable, it lacks the agility of smaller luxury cars or modern performance sedans.

5. **Rust and Body Condition (Especially in Snowy Climates)**

Some early LS400s (particularly those from cold regions) suffer from **rust**, particularly in the wheel wells, rocker panels, and undercarriage. A thorough inspection of the body and undercarriage is essential before purchase.

6. **Oil Consumption (In Some Examples)**

While not universal, some 1UZ-FE engines develop **oil consumption** over time, requiring more frequent top-ups. This is more common in high-mileage examples but can be mitigated with synthetic oil and regular maintenance.

7. **Limited Modern Safety Features**

- Electronic stability control (ESC)

- Advanced airbag systems (beyond dual front and side-impact bags)

- Lane-keeping assist or adaptive cruise control

- Modern collision avoidance systems

While safe by its standards, it doesn t meet today s safety benchmarks.

8. **Discontinued Parts and Dealer Support**

- Original manufacturer parts may become harder to find over time.

- Dealers are less likely to offer extended warranties or financing incentives.

- Some aftermarket parts may not be as refined as they were in the 2000s.

9. **Potential Transmission Issues (U341E Automatic)**

The **U341E 4-speed automatic** is generally reliable but can develop **slippage or rough shifting** in high-mileage examples. Some owners report **solenoid failures** or **fluid degradation**, which can lead to poor acceleration or transmission failure. Regular transmission fluid changes (every 60,000 miles) are crucial.

10. **High Purchase Price for a Used Luxury Car**

While the LS400 holds value well, **well-maintained examples can still be expensive** compared to other luxury sedans of similar age. Buyers should ensure the price reflects the vehicle s condition, mileage, and service history.

---

### **Conclusion**

The **1998-2000 Lexus LS400 with a 4.0L 1UZ-FE engine** is a **fantastic choice for buyers who prioritize reliability, luxury, and driving enjoyment** provided they are prepared for **potential throttle body sensor issues** and the vehicle s age-related limitations. It remains one of the most **underappreciated luxury sedans** from the late '90s, offering a **smooth, powerful, and comfortable** driving experience with minimal long-term mechanical concerns (outside of the TBC issue).

- Enthusiasts who appreciate **Japanese engineering and V8 power**.

- Buyers who want a **low-maintenance, high-reliability** luxury sedan with **strong resale value**.

- Those who prefer **manual transmission** (if available) or a **smooth automatic** without modern distractions.

- Owners who enjoy **driving dynamics** and **understated elegance** over cutting-edge tech.

- Buyers who need **modern infotainment or safety features**.

- Those who prioritize **fuel efficiency** or **city maneuverability**.

- People who dislike **occasional mechanical quirks** (e.g., throttle body sensor, transmission maintenance).

- Buyers who want **easy access to parts or dealer support** (though aftermarket options are strong).

---

### **Recommendation**

- **Under 150,000 miles** (preferably under 120,000).

- **Full service records**, especially for **oil changes, timing chain inspection, and transmission fluid**.

- **No major rust or frame damage**.

- **A replaced or cleaned throttle body sensor** (or one that tests fine).

- **A smooth-running engine** (no excessive oil consumption or misfires).

**Buy it.** The LS400 is a **timeless luxury sedan** that will serve you well for **150,000 miles with proper care**. Address the throttle body sensor issue upfront, and you ll have a **

Details:

Trucks often run late, and they can come without a call at any time. Shipping Info. ENGINE: 4.0L 1UZFE RWD. Warranty does NOT cover labor, diagnostic, towing, or rental car costs.

Regular mail USPS, FedEx, UPS. TRANSMISSION: AT AUTO A650E. Contact phone number of the receiving person;. Enter the yard by permission only.

REMOVED FROM: 2000 Lexus LS400 UCF20L. Please remember. The color in the photos may be different from real one. MILEAGE: 164,235.

Examples of these non-warranty parts include switches, sensors, cables, coils, wires, injectors, electronics, belts including timing belt/chain, hoses, water pumps, brackets, intake/exhaust manifolds, oil pans, and turbos/superchargers. If you don't want any surprises - keep in touch with a transporter yourself. E-mail address to send a confirmation. For large items engines, doors, transmissions, body parts, etc.

Company name and address;.

part #: 8945730140 prices

• $84.99-$169.18

specifications throobo:

• for models: Ls400
• for makes: Lexus
• for years: 1998-2000
• mpn: 89457-30140
• type: Throttle Body
• manufacturer warranty: 3 Months
• country of origin: Japan

shipping throobo:

• cost: $0.00
• type: Calculated
• transit: 3-7 Days
• carrier: UPS
• service: UPS Ground, UPS 2nd Day Air, UPS Next Day Air
• class: Standard, Expedited, One-day

offer throobo:

• best offers: True
• options: Ship-to-home
• quantity: 1
• started: March 12, 2026
• sold: 0
• availability: In Stock

general throobo:

• Car Truck Parts Accessories > Air Fuel Delivery > Throttle Bodies
• condition: Used

returns throobo:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

payments throobo:

• other
• credit card: Discover
• wallet: Apple-pay

seller throobo:

• # reviews: 31153
• city: New Brunswick, New Jersey
• rating: 99.7%

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