804295T Mercury Thermosensor | Genuine Used Part
804295T Mercury Thermosensor | Genuine Used Part
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🔧 Product Description
Genuine Mercury Four-Stroke Engine Temperature Sensor - Part Number: 804295T
A genuine used Mercury Marine engine-temperature sensor for selected Yamaha-derived 75HP, 80HP, 90HP, 100HP and 115HP four-stroke outboard motors.
The sensor measures engine or cooling-system temperature and sends a variable signal to the engine control or warning system.
⚙️ Key Features
- Genuine used Mercury Marine thermosensor
- Correct OEM part number 804295T
- Yamaha cross-reference 67F-85790-00-00
- Fits selected Yamaha-derived Mercury four-stroke engines
- Variable-resistance temperature sensor rather than a simple overheat switch
🚤 Compatibility
Commonly used on
- Yamaha-derived Mercury and Mariner four-stroke cooling systems
- Carburetted and selected EFI engine-management systems
Typically suits
- Engine models:
- Mercury / Mariner 75HP four-stroke
- Mercury / Mariner 80HP four-stroke
- Mercury / Mariner 90HP four-stroke
- Mercury / Mariner 100HP four-stroke
- Mercury / Mariner 115HP four-stroke
- Production groups from approximately 2000-2006 using thermosensor 804295T
- HP Range: 75HP - 115HP
- Engine Type: Mercury / Mariner Yamaha-derived inline four-cylinder four-stroke outboard
- Year Range: Approximately 2000-2006
🔌 Function
The sensor changes resistance according to engine temperature. The engine-management and warning systems use this signal for temperature monitoring, fuel compensation and overheat protection.
⚠️ Common Signs of Failure
- Temperature warning activates with a cold engine
- Overheat protection does not operate
- Temperature reading is fixed or erratic
- Engine runs excessively rich during warm-up
- Temperature-related diagnostic code is stored
- Sensor resistance is outside specification
- Connector or harness movement changes the reading
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 804295T current Mercury thermosensor reference
OEM / Related Numbers
- 804295T
- 804295
- 67F-85790-00-00 Yamaha cross-reference
- 67F857900000
- 804296 related sensor retainer
- 27-8042971 related sensor gasket or seal
- Related engine wiring harness and temperature-warning circuit
Aftermarket / Verified Equivalents
- Engineroom: M9586 - replacement thermosensor
- Aftermarket direct replacement under Mercury 804295T
- Aftermarket direct replacement under Yamaha 67F-85790-00-00
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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