803148 Throttle Position Sensor for Mercruiser Volvo Penta OMC | JLM Marine

Throttle Position Sensor 803148 – Fits Mercruiser, Volvo Penta & OMC Marine Engines

This Throttle Position Sensor is designed for OMC/Volvo Penta 7.4L and 8.2L marine stern drive models, as well as Mercruiser GM 5.7L and 6.2L MPI engines. It delivers reliable throttle position feedback to ensure optimal engine performance and fuel efficiency across a range of high-performance marine applications.

Direct Replacements: OMC Volvo Penta Marine 3855296, Sierra Marine 18-7757, OEM 803148.

• Compatible with OMC/Volvo Penta 7.4 GSI, 8.2 GSI, DPX 385, and Mercruiser GM 5.7L/6.2L MPI engines
• Designed for marine stern drive applications
• Aftermarket replacement built to OEM specifications

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 × Throttle Position Sensor (Used for Marine Engine)

Installation Guide

1. Disconnect the negative battery cable to ensure safety before beginning work.
2. Locate the existing throttle position sensor on your engine's throttle body assembly.
3. Disconnect the electrical connector from the old sensor by pressing the release tab and pulling gently.
4. Remove the mounting screws or bolts securing the sensor to the throttle body using the appropriate tools.
5. Carefully remove the old sensor from the throttle shaft. Note the orientation and position for proper installation of the new sensor.
6. Clean the mounting surface on the throttle body to ensure a proper seal and connection.
7. Position the new throttle position sensor onto the throttle shaft, aligning it exactly as the original was installed.
8. Secure the new sensor with the mounting screws or bolts, tightening them evenly to manufacturer specifications.
9. Reconnect the electrical connector to the new sensor, ensuring it clicks firmly into place.
10. Reconnect the negative battery cable.
11. Start the engine and verify that it idles smoothly and responds correctly to throttle inputs.
12. If the engine control unit requires sensor calibration or a reset, consult your engine's service manual for specific procedures.

Troubleshooting & FAQ

Q: How do I confirm this sensor fits my engine?
A: Cross-reference your current part number with the OEM numbers listed (803148, 3855296, 18-7757) and verify your engine model in our compatibility table. If your model and part number match, this sensor will fit.

Q: What are the signs that my throttle position sensor is failing?
A: Common symptoms include rough or erratic idle, poor throttle response, hesitation during acceleration, increased fuel consumption, or engine stalling. In some cases, a check engine light may illuminate with a TPS-related diagnostic code.

Q: How often should I replace the throttle position sensor?
A: Throttle position sensors typically last many years under normal use. Replace the sensor when you experience symptoms of failure or as recommended in your engine's maintenance schedule—usually not a routine replacement item.

Q: Can I install this sensor myself or do I need a professional?
A: Installation is straightforward for those with basic mechanical skills and tools. However, proper alignment and calibration are critical for engine performance, so professional installation is recommended if you're unsure.

Q: Is this an OEM part or aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.