3858987 3859020 Volvo Sensor | Genuine Used Part

🔧 Product Description

Genuine Volvo Penta Manifold Pressure and Temperature Sensor - Part Numbers: 3858987 & 3859020

A genuine used Volvo Penta MAP or TMAP sensor for selected GM-based electronic-fuel-injected petrol marine engines.

The sensor measures intake-manifold pressure and, on applicable TMAP configurations, incoming-air temperature. The engine control module uses these inputs to calculate engine load, fuel delivery and ignition timing.

⚙️ Key Features

• Genuine used Volvo Penta engine-management sensor
• Cross-references Volvo Penta numbers 3858987 and 3859020
• Used on selected 4.3L, 5.0L, 5.7L and 6.0L petrol engines
• Measures manifold pressure and applicable intake temperature
• Compatible with selected MerCruiser, PCM and Marine Power applications using the same sensor

🚤 Compatibility

Commonly used on

• Volvo Penta GM-based EFI petrol engines
• Multi-port fuel-injection and electronic ignition systems

Typically suits

• Engine models:
• Volvo Penta 4.3Gi and 4.3GXi applications
• Volvo Penta 5.0Gi and 5.0GXi applications
• Volvo Penta 5.7Gi and 5.7GXi applications
• Volvo Penta 5.7GXi-C
• Volvo Penta 5.7GXi-CF
• Volvo Penta 6.0GXi applications
• OSi and OSXi inboard models using the matching sensor
• MerCruiser and PCM engines specifying the listed cross-reference numbers
• Engine Type: GM-based V6 and V8 EFI petrol marine engine
• Year Range: Primarily early-to-mid 2000s, dependent on engine serial number

🔌 Function

The sensor sends an electrical signal representing intake-manifold pressure and applicable air temperature. The ECU uses this information to calculate engine load and atmospheric compensation.

⚠️ Common Signs of Failure

• Engine idles roughly
• Acceleration is hesitant
• Fuel consumption increases
• Engine runs excessively rich or lean
• MAP or intake-temperature fault code is stored
• Engine enters reduced-power mode
• Sensor reading remains fixed
• Vacuum port or manifold passage is restricted

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3859020 later Volvo Penta sensor reference
• 3858987 earlier related Volvo Penta sensor reference

OEM / Related Numbers

• 3858987
• 3859020
• MerCruiser 885165
• MerCruiser 8M0087834
• General Motors 12568929
• PCM / Crusader R020039
• Marine Power 462717
• Related intake-manifold sensor seal and retaining clip

Aftermarket / Verified Equivalents

• Recmar: REC8M0087834 - MAP / TMAP sensor
• Aftermarket replacement sensor under 3858987
• Aftermarket replacement sensor under 3859020
• Aftermarket replacement sensor under GM 12568929

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated