Air Charge Temperature Sensor – Fits MerCruiser Volvo Penta V6 V8 MPI (Replaces 805223T, 3854527, 18-7702)

Product Details

This Air Charge Temperature Sensor is designed for MerCruiser and Volvo Penta marine engines, including V6 and V8 MPI models such as the 350, 454, 496, and 502 series. The Intake Air Temperature (IAT) Flame Arrestor Sensor Assembly monitors air charge temperature for optimal engine performance across 7.4L (1994–2000) and 8.1L (2005–Current) applications.

This aftermarket sensor directly replaces Mercury MerCruiser 805223T, Volvo Penta 3854527, and Sierra Marine 18-7702.

• Intake Air Temperature Flame Arrestor Sensor Assembly for MPI engines
• Compatible with most Volvo Penta and MerCruiser V6/V8 models
• Drop-in replacement for factory sensors

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Type

Intake Air Temperature Flame Arrestor Sensor

Engine Type

VOLVO PENTA MerCruiser Marine Engines

Application

V6 & V8 MPI

What's in the Box

• 1 × Intake Air Temperature Sensor

Installation Notes

1. Disconnect the battery negative terminal before beginning work.
2. Locate the existing air charge temperature sensor on the intake manifold or flame arrestor.
3. Disconnect the electrical connector from the old sensor.
4. Remove the sensor by unscrewing it counterclockwise from the housing.
5. Inspect the mounting threads and clean if necessary.
6. Install the new sensor hand-tight, then snug with a wrench—do not overtighten.
7. Reconnect the electrical connector until it clicks into place.
8. Reconnect the battery and start the engine to verify proper operation.

Troubleshooting & FAQ

How do I know if my air charge temperature sensor is failing?

Common symptoms include rough idle, poor fuel economy, engine hesitation, or diagnostic trouble codes related to intake air temperature. The engine control module relies on accurate air temperature readings for optimal fuel delivery.

Will this sensor work with my flame arrestor?

Yes, this is an Intake Air Temperature Flame Arrestor Sensor Assembly designed to mount directly on compatible MerCruiser and Volvo Penta flame arrestors. Verify your engine model against the compatibility table above.

What's the difference between this and the OEM sensor?

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.

Can I install this sensor myself?

Installation is straightforward for those comfortable with basic marine engine service. The sensor threads into the intake assembly and requires only a wrench and electrical connector. Professional installation is recommended if you are unfamiliar with marine electrical systems.

How often should I replace the air charge temperature sensor?

Replace the sensor when diagnostic codes appear, when the engine exhibits performance issues related to air–fuel mixture, or if the sensor is physically damaged. Sensors do not have a fixed service interval but should be inspected during routine maintenance.

Is this sensor compatible with both V6 and V8 engines?

Yes, this sensor fits MerCruiser V6 and V8 MPI engines, including 350, 454, 496, and 502 models, as well as most Volvo Penta V6/V8 MPI configurations. Always cross-reference your OEM part number to confirm fitment.

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 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.