MAP Sensor – Fits Volvo Penta, OMC, MerCruiser 4.3L-8.2L (Replaces 3850396, 864856A1)
MAP Sensor – Fits Volvo Penta, OMC, MerCruiser 4.3L-8.2L (Replaces 3850396, 864856A1) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
MAP Sensor – Fits Volvo Penta, OMC, MerCruiser 4.3L-8.2L (Replaces ...
Product Details
This Manifold Absolute Pressure (MAP) Sensor – Fits Volvo Penta, OMC, MerCruiser 4.3L-8.2L restores crucial engine data for optimal performance. It is designed as a direct-fit replacement for V6 and V8 EFI gasoline engines from Volvo Penta (1994–2007), OMC (1994–1998), and MerCruiser (1993–2007).
It provides a reliable aftermarket cross-reference for Volvo Penta 3850396, OMC 3850396, MerCruiser 864856A1, and Sierra 18-7684.
- Engineered as a direct OEM replacement for straightforward installation.
- Specifically for gasoline EFI engines with single point injection systems.
- Features a standard electrical 3-pin connector for a secure connection.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3850396 |
| OMC | 3850396 |
| MerCruiser | 864856A1 |
| Sierra | 18-7684 |
| Aftermarket | AM3850396 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This sensor fits a wide range of Volvo Penta 4.3L to 8.2L GI, GL, GS, and GXi series engines manufactured between 1994 and 2007.
Compatible with OMC V6 and V8 EFI engines from 1996 to 1998, including various 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L models.
Fits numerous MerCruiser 4.3L, 5.0L, 5.7L, 350, 454, 502, 7.4L, and 8.2L EFI and MPI engines from 1993 to 2007.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 4.3GI, 4.3GL, 4.3GS series | 160-320 | 4-Stroke | 1994–2001 | 3850396 | Multiple model variants |
| Volvo Penta | 4.3GXi-A | 225 | 4-Stroke | 2000–2001 | 3850396 | |
| Volvo Penta | 5.0GI, 5.0GL, 5.0GS series | 220-250 | 4-Stroke | 1994–2002 | 3850396 | Multiple model variants |
| Volvo Penta | 5.0GXi-A | 270 | 4-Stroke | 2001–2002 | 3850396 | |
| Volvo Penta | 5.7GI, 5.7GL, 5.7GS series | 215-280 | 4-Stroke | 1994–2002 | 3850396 | Multiple model variants |
| Volvo Penta | 5.7GXi-A/B, 5.7GXiI-A/B | 270-320 | 4-Stroke | 2000–2002 | 3850396 | |
| Volvo Penta | 5.8FSI series | 380 | 4-Stroke | 1995–1996 | 3850396 | |
| Volvo Penta | 7.4GI, 7.4GL, 7.4GS series | 310-405 | 4-Stroke | 1994–2000 | 3850396 | Multiple model variants |
| Volvo Penta | 8.2GS series | 415 | 4-Stroke | 1995–2000 | 3850396 | |
| Volvo Penta | DPX385X, DPX415X series | 302-415 | 4-Stroke | 1996–2000 | 3850396 | |
| OMC | 43F series (V6) | 4.3L | 4-Stroke | 1996–1998 | 3850396 | |
| OMC | 432, 434 series (V6) | 4.3L | 4-Stroke | 1996–1998 | 3850396 | |
| OMC | 50FB, 502B series (V8) | 5.0L | 4-Stroke | 1997–1998 | 3850396 | |
| OMC | 572B, 574B series (V8) | 5.7L | 4-Stroke | 1996–1998 | 3850396 | |
| OMC | 57FA, 57FC, 57FD series (V8) | 5.7L | 4-Stroke | 1996–1998 | 3850396 | |
| OMC | 744D, 744E, 744F series (V8) | 7.4L | 4-Stroke | 1995–1997 | 3850396 | |
| OMC | 74FE, 74FF, 74FG, 74FH, 74FJ series (V8) | 7.4L | 4-Stroke | 1995–1998 | 3850396 | |
| OMC | 82FC series (V8) | 8.2L | 4-Stroke | 1998 | 3850396 | |
| MerCruiser | 4.3L V6 EFI engines | 4.3L | 4-Stroke | 1994–2007 | 864856A1 | Various models including Alpha/Bravo |
| MerCruiser | 5.0L V8 EFI engines | 5.0L | 4-Stroke | 1993–2007 | 864856A1 | Various models including Alpha/Bravo |
| MerCruiser | 5.7L V8 EFI engines | 5.7L | 4-Stroke | 1993–2007 | 864856A1 | Various models including Alpha/Bravo |
| MerCruiser | 350 MAG EFI | 350 | 4-Stroke | 1994–1997 | 864856A1 | Various configurations |
| MerCruiser | 350 MAG MPI | 350 | 4-Stroke | 1995–1997 | 864856A1 | Various configurations |
| MerCruiser | 454 EFI Gen V/VI | 454 | 4-Stroke | 1994–1998 | 864856A1 | |
| MerCruiser | 454 MAG MPI | 454 | 4-Stroke | 1996–1998 | 864856A1 | Gen VI |
| MerCruiser | 502 EFI/MPI | 502 | 4-Stroke | 1993–1998 | 864856A1 | Gen V/VI |
| MerCruiser | 7.4L MPI | 7.4L | 4-Stroke | 1995–1997 | 864856A1 | Gen V/VI |
| MerCruiser | 8.2L MPI | 8.2L | 4-Stroke | 1996–1997 | 864856A1 | Gen VI |
| MerCruiser | Scorpion 377 | 377 | 4-Stroke | 1997–2004 | 864856A1 | |
| MerCruiser | Black Scorpion 350 MAG | 350 | 4-Stroke | 1996–2001 | 864856A1 |
Technical Specs
- Product Type
- Manifold Absolute Pressure (MAP) Sensor
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline EFI
- Connection
- Electrical 3-pin connector
- Housing Material
- Plastic with metal components
- Housing Color
- Black
- Dimensions
- 11.5 × 10.0 × 7.5 cm (4.53 × 3.94 × 2.95 inches)
- Weight
- 50 g (1.76 oz)
- Other Technical Attributes
- Used on single point injection EFI systems
What’s in the Box
- 1 x MAP Sensor (3850396/864856A1)
Installation Notes
- Disconnect the negative battery terminal to ensure safety.
- Locate the MAP sensor, which is typically mounted directly on the intake manifold.
- Carefully disconnect the electrical harness from the sensor.
- Unscrew the mounting bolt(s) holding the sensor in place and gently remove it.
- Clean the mounting surface to ensure a proper seal with the new sensor.
- Position the new MAP sensor and tighten the mounting hardware to the manufacturer's recommended torque. Do not overtighten.
- Securely reconnect the electrical connector.
- Reconnect the negative battery terminal.
- Start the engine and check for a smooth idle and ensure the check engine light is off.
Troubleshooting & FAQ
How do I know if my MAP sensor is failing?
Common signs of a faulty MAP sensor include a rough idle, poor fuel economy, engine hesitation or stumbling during acceleration, and an illuminated check engine light with corresponding fault codes.
Where is this sensor located on the engine?
The Manifold Absolute Pressure (MAP) sensor is almost always mounted on the intake manifold of the engine, allowing it to measure the pressure (vacuum) inside.
Can I use this on a multi-point injection (MPI) engine?
This sensor is primarily specified for single point injection (TBI/EFI) systems. While some MPI models are listed as compatible, it is crucial to verify your OEM part number (864856A1 or 3850396) before ordering, as many MPI systems use a different sensor.
What happens if I don't replace a bad MAP sensor?
A failing MAP sensor provides incorrect data to the engine control unit (ECU), which can lead to a rich or lean fuel mixture. This can cause increased emissions, reduced engine power, poor fuel mileage, and potential long-term damage to the catalytic converter.
OEM vs. Aftermarket?
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.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs 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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
