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Throttle Position Sensor 803148 – Fits MerCruiser 350 Mag & Black Scorpion
- $55.77
- $55.77
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How to Match This Part
This aftermarket throttle position sensor (TPS) replaces Mercury MerCruiser / Quicksilver 803148 (later catalogued as 8M0230659). It bolts to the throttle body and reports throttle-shaft angle to the ECM so fuel delivery and spark timing stay in sync. This listing is a brand-new sensor, not a remanufactured or rebuilt unit.
Match this part in this order:
1. OEM number on the removed sensor — 803148 or 8M0230659
2. Engine model and serial number — MerCruiser MCM / MIE 350 Mag and Black Scorpion Ski from serial 0L005900 and up (serial plate on the engine block or flame-arrestor cover)
3. Physical form — black two-hole mounting flange, light grey rotor face, and a single sealed side connector
Compare the mounting ears, rotor slot, and connector shape with the product images before ordering. If your original sensor carries a different OEM number or a different connector layout, do not use this part.
Part Number Cross-Reference
Use these verified numbers to confirm you have the correct throttle position sensor. Brand names and OEM numbers are for identification only.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Mercury MerCruiser / Quicksilver | 803148 | Primary reference (SENSOR-TPS) |
| OEM | Mercury MerCruiser / Quicksilver | 8M0230659 | Later catalog / supersession of 803148 |
| OEM | Volvo Penta / OMC Stern Drive | 3855296 | Interchange OEM number for the same TPS family |
| Aftermarket | Sierra Marine | 18-7757 | Direct cross-reference |
| Aftermarket | Mallory Marine | 9-33700 | Direct cross-reference |
| Aftermarket | CDI Electronics | E13-0008 | Direct cross-reference |
| Aftermarket | ARCO | TP001 | Direct cross-reference |
This is an aftermarket part manufactured by JLM Marine. It is not sold as a genuine Mercury, MerCruiser, Quicksilver, Volvo Penta, or OMC component.
Compatible Engine Models
Confirm your MerCruiser model and serial before ordering. Serial location guide: Mercury Parts Diagrams. Always match the OEM number and physical form of the sensor you remove.
| Brand | Engine Model | Serial Number Range | Notes |
|---|---|---|---|
| MerCruiser | MCM / MIE 350 Mag | 0L005900 & Up | Replaces 803148 / 8M0230659 |
| MerCruiser | Black Scorpion Ski | 0L005900 & Up | Replaces 803148 / 8M0230659 |
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Throttle Position Sensor (TPS) |
| Primary OEM replaced | Mercury MerCruiser / Quicksilver 803148 (also 8M0230659) |
| Mounting | Bolt-on throttle-body mount with two-hole flange |
| Connector | Single sealed side connector (plug-in to the existing engine harness) |
| Housing form | Black molded body with light grey rotor face over the throttle-shaft coupling |
| Condition | Brand new — not remanufactured |
Installation Guide
- 1 Disconnect the battery negative cable and let the engine cool. Remove the flame arrestor if it blocks access to the throttle body.
- 2 Release the locking tab and unplug the harness from the old sensor. Note how the connector is routed so the new lead is not strained against the throttle linkage.
- 3 Remove the two mounting screws and lift the sensor off the throttle shaft. Compare the old and new units side by side: flange holes, rotor slot, and connector position must match.
- 4 Align the new sensor rotor with the flat of the throttle shaft, seat it fully against the throttle body, then fit the screws and tighten evenly to the torque in your MerCruiser service manual. Reuse the original screws unless they are corroded or damaged.
- 5 Reconnect the harness until the lock clicks, refit the flame arrestor, and reconnect the battery. If your service manual specifies a TPS voltage check or reset, follow that procedure with a digital multimeter or the manufacturer diagnostic tool.
- 6 Start the engine, let it idle, and open and close the throttle slowly while checking for smooth response and no stored fault codes.
Note: Professional installation is recommended for EFI throttle-body sensors.
Troubleshooting & FAQ
Important Notes
- Match the OEM number and the physical form of your original sensor before ordering. A different connector or flange means a different part.
- Serial number 0L005900 and up applies to the MerCruiser applications listed above. Confirm your plate before purchase.
- This is an aftermarket part. Brand names and part numbers are for reference only.
- Professional installation is recommended for EFI throttle-body sensors.
Why Choose JLM MARINE?
- Precision Fit: Cross-referenced to Mercury MerCruiser / Quicksilver 803148 and 8M0230659 for the MerCruiser applications listed above.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine sensors engineered for reliable throttle-position feedback on MerCruiser EFI systems.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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