MERCURY Tps Throttle Position Sensor 14851-2 14851-1 2.5L V6

( Manufacturer Part Number: 148512 ), ( Part Type: Throttle Sensor )

Review MERCURY 14851 Oem 2.5l V6 Tps Throttle Position Sensor fits EFI

The **Mercury 148512 Throttle Position Sensor (TPS)** part of the broader **14851 series** (including models **14851-1**, **14851-2**, and **14851-2.5L V6 EFI**) is a precision-engineered component designed to monitor the throttle blade s angle in Mercury marine engines, ensuring optimal fuel delivery and performance. This critical sensor operates within the engine s Electronic Fuel Injection (EFI) system, providing real-time feedback to the engine control module (ECM) about throttle position, which directly influences air-fuel mixture ratios, idle stability, and overall engine responsiveness. Built to withstand the harsh marine environment, the **148512 TPS** features a robust construction with corrosion-resistant materials, including a sealed housing and precision-machined potentiometer mechanism, ensuring durability in saltwater, humidity, and temperature fluctuations. The sensor s internal wiring harness is designed for easy installation, with a straightforward plug-and-play connection that minimizes downtime during maintenance or replacement. Whether integrated into a **2.5L V6 EFI** engine or other compatible Mercury outboard models, this throttle position sensor plays a pivotal role in maintaining smooth acceleration, preventing stalling, and enhancing fuel efficiency key factors for both recreational boaters and professional anglers demanding reliable performance. Its compatibility with advanced engine management systems allows for seamless integration with modern diagnostics tools, enabling quick troubleshooting and calibration when needed. For marine enthusiasts seeking long-term reliability and peak engine performance, the **Mercury 148512 TPS** stands as an essential, high-quality component that bridges precision engineering with the demands of open-water operation.

### **Pros and Cons of Buying a Replacement Throttle Position Sensor (TPS) for a Mercury 2.5L V6 EFI Engine (Part Numbers: 148512, 14851-2, 14851, 14851-1)**

#### **Pros of Purchasing a Replacement TPS**

1. **Restores Engine Performance** A faulty TPS can cause rough idling, stalling, or poor acceleration. Replacing it ensures the engine runs smoothly and responds correctly to throttle input.

2. **Prevents Further Damage** A failing TPS may force the engine control unit (ECU) into limp mode, restricting power to protect the engine. Replacing it avoids unnecessary wear on other components.

3. **Improves Fuel Efficiency** A malfunctioning TPS can lead to incorrect air-fuel mixture calculations, wasting fuel. A working sensor optimizes fuel delivery.

4. **Prevents Check Engine Light (CEL) Issues** A bad TPS triggers OBD-II codes (e.g., P0120, P0121, P0122, P0123), which can lead to failed emissions tests or difficulty selling the vehicle. Replacement resolves these codes.

5. **Compatibility with Aftermarket Mods** If you plan to modify the engine (e.g., forced induction, performance tuning), a reliable TPS ensures accurate throttle response for tuning software.

6. **Warranty Coverage (If Applicable)** Some OEM or high-quality aftermarket sensors come with warranties, providing peace of mind against premature failure.

7. **Easier Installation** The TPS is a relatively straightforward replacement, often requiring only basic tools and minimal mechanical skill.

#### **Cons of Purchasing a Replacement TPS**

1. **Cost** While not extremely expensive, a quality OEM or aftermarket TPS can range from **$50 to $150**, depending on brand and availability. Labor costs (if not DIY) may add to the expense.

2. **Potential Counterfeit Parts** Cheap or knockoff sensors may fail prematurely or not function correctly, leading to repeated replacements and frustration.

3. **DIY Difficulty for Beginners** While the job is manageable, some users may struggle with wiring connections or sensor calibration, especially if the vehicle has advanced diagnostics.

4. **Recalibration Needed** Some modern vehicles require a TPS recalibration after replacement, which may require a scan tool or dealership visit, adding cost.

5. **Risk of Incorrect Part Selection** Using the wrong part number (e.g., mixing up 14851-1 vs. 14851-2) could result in compatibility issues or poor performance.

6. **Time-Consuming for Busy Owners** If not doing it yourself, scheduling a shop appointment may take time, especially if parts are backordered.

7. **Secondary Issues May Arise** If the TPS failure was due to a deeper problem (e.g., wiring corrosion, ECU issues), replacing just the sensor may not fully resolve the problem.

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### **Conclusion**

A replacement throttle position sensor is a **necessary and worthwhile investment** if your Mercury 2.5L V6 engine is experiencing throttle-related issues. The benefits restored performance, fuel efficiency, and prevention of further damage far outweigh the minor drawbacks, particularly if you choose a **reputable brand** and ensure proper installation.

- **Verify the correct part number** (14851-1 or 14851-2, depending on your model year) to avoid mismatches.

- **Consider OEM or high-quality aftermarket brands** (e.g., Delphi, Denso, or ACDelco) for reliability.

- **Follow installation instructions carefully**, especially regarding wiring and potential calibration steps.

- **Diagnose the root cause** if the TPS keeps failing, check for wiring issues, ECU problems, or other sensor malfunctions.

If you're comfortable with basic automotive work, **DIY installation is recommended** to save labor costs. If not, a trusted mechanic can handle it efficiently.

### **Final Recommendation**

**Buy a replacement TPS** if your vehicle exhibits symptoms like rough idling, stalling, or check engine lights related to throttle position. Prioritize **quality over price** to avoid repeated failures. For long-term reliability, consider upgrading to a **high-performance or aftermarket TPS** if you plan to modify the engine. Always cross-reference part numbers with your vehicle s specific model year to ensure compatibility.

Details:

Good used OEM Mercury 2.5L V6 EFI TPS Throttle Position Sensor 148512 14851-2 14851 This is for the later 90s early 2000 engine Make sure that your outboard has same plug type.

part #: 148512 prices

• $499.99-$716.00

specifications ouboaen:

• for models: Efi
• for makes: Mercury
• mpn: 148512
• part type: Throttle Sensor

offer ouboaen:

• availability: In Stock
• started: April 11, 2026
• options: Ship-to-home
• quantity: 1
• sold: 0

returns ouboaen:

• policy: No Returns

seller ouboaen:

• city: Lenoir City, Tennessee
• # reviews: 5210
• rating: 99.9%

general ouboaen:

• Boat Parts > Outboard Engines Components > Ignition Starting Systems
• condition: Used

payments ouboaen:

• other
• wallet: Google-pay
• credit card: Mastercard

shipping ouboaen:

• service: USPS Ground Advantage
• carrier: USPS
• transit: 5-11 Days
• type: Calculated
• class: Standard
• cost: $8.10

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