MAP Sensor – Fits Volvo Penta OMC 4.3L 5.0L 5.7L 7.4L (Replaces 3850396, 18-7684)
MAP Sensor – Fits Volvo Penta OMC 4.3L 5.0L 5.7L 7.4L (Replaces 3850396, 18-7684) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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MAP Sensor – Fits Volvo Penta OMC 4.3L 5.0L 5.7L 7.4L (Replaces 385...
MAP Sensor – Fits Volvo Penta OMC 4.3L 5.0L 5.7L 7.4L (Replaces 3850396, 18-7684) is backordered and will ship as soon as it is back in stock.
Product Details
This MAP Sensor is engineered for Volvo Penta and OMC marine engines, including 4.3L, 5.0L, 5.7L, and 7.4L fuel-injected models spanning 1994–2007. Designed to ensure accurate manifold pressure readings, this sensor supports reliable engine performance across a broad range of displacement configurations.
Direct aftermarket replacement for OEM numbers 3850396 (Volvo Penta / OMC) and Sierra Marine 18-7684.
- Compatible with Volvo Penta 4.3L, 5.0L, 5.7L, 7.4L (1994–2007) and OMC 4.3L TBI, 5.0L TBI, 5.7L TBI, 7.4L, 8.2L (1995–1998)
- Marine-specific design built to withstand saltwater and harsh operating environments
- Precision fit for plug-and-play installation on fuel-injected systems
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 3850396 |
| Volvo Penta | 3850396 |
| Sierra Marine | 18-7684 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Years |
|---|---|---|
| Volvo Penta | 4.3L | 1994–2007 |
| Volvo Penta | 5.0L | 1994–2007 |
| Volvo Penta | 5.7L | 1994–2007 |
| Volvo Penta | 7.4L | 1994–2007 |
| OMC | 4.3L TBI | 1996–1998 |
| OMC | 5.0L TBI | 1998 |
| OMC | 5.7L TBI | 1996–1998 |
| OMC | 7.4L | 1995–1998 |
| OMC | 8.2L | 1998 |
Technical Specs
- OEM Number
- 3850396
- Application
- Marine fuel-injected engines
- Sensor Type
- Manifold Absolute Pressure (MAP)
- Compatibility
- Volvo Penta & OMC 4.3L, 5.0L, 5.7L, 7.4L, 8.2L models
Installation Notes
- Disconnect the battery negative terminal to prevent electrical shorts.
- Locate the MAP sensor on the intake manifold or firewall, depending on your engine configuration.
- Disconnect the electrical connector from the old sensor.
- Remove any mounting bolts or clips securing the sensor, then extract the old unit.
- Inspect the vacuum hose (if present) for cracks or blockages; replace if necessary.
- Install the new MAP sensor, ensuring a secure seal at the mounting surface.
- Reconnect the electrical connector until it clicks into place.
- Reconnect the battery and start the engine to verify proper operation and check for error codes.
Troubleshooting & FAQ
How do I know if my MAP sensor has failed?
Common symptoms include rough idling, poor acceleration, reduced fuel economy, check-engine light, or the engine stalling under load. A diagnostic scan tool can confirm fault codes related to manifold pressure.
Is this sensor suitable for saltwater use?
Yes. This sensor is designed specifically for marine environments and built to resist corrosion from saltwater exposure.
Will this work on carbureted engines?
No. This MAP sensor is designed exclusively for fuel-injected marine engines. Carbureted systems do not use MAP sensors.
Do I need to reprogram the ECU after installation?
Typically not. Most systems will auto-calibrate once the new sensor is installed. Clearing stored error codes with a scan tool is recommended.
Can I clean and reuse my old MAP sensor?
Cleaning is rarely effective for failed MAP sensors. Internal components may be damaged, and improper cleaning can worsen performance. Replacement is the safest option.
What's the difference between this and the OEM part?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
How quickly will my order ship?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Returns and product support
For return eligibility, deadlines and instructions, see SeaSierra’s Refund Policy. Contact SeaSierra before ordering if you need product-specific warranty information.
What tools are required for installation?
Basic hand tools such as a socket set or wrench to remove mounting hardware, plus a flathead screwdriver or pick to release the electrical connector. A diagnostic scan tool is useful for clearing codes after installation.
Safety & Important Info
- Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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