Cummins 3918461 — Genuine Intake Air Temperature (IAT) Sensor

MPN: 3918461  |  Also Known As: intake air temp sensor, charge air temp sensor, IAT

Restore accurate intake temperature readings on your 12-valve. The genuine Cummins 3918461 IAT sensor is the OE unit for 1991.5–1997 Dodge/Ram 5.9L 12-valve applications. It installs in the intake horn/plenum plate and feeds temperature data to the engine controls for proper cold-start, fueling and grid-heater strategy.

Features & Benefits

• OE calibration for correct intake air temp readings and stable drivability.
• Direct-fit to the factory intake horn/plenum—no adapters or rewiring.
• Improves cold-start behavior and reduces smoke when the old sensor drifts.
• Durable sensing element designed for heat, vibration, and oil mist exposure.
• Genuine Cummins part for traceability and long service life.

Verified Fitment (Automotive)

Industrial/Off-Highway: Cummins catalogs 3918461 as a Temperature Sensor used primarily on Non-Certified 5.9L B-Series engines—verify by ESN for equipment engines.

Specifications

• Type: Intake Air Temperature (IAT) sensor (thermistor)
• OE Part Number: 3918461
• Location: Intake horn / plenum plate
• Quantity Required: 1 per engine

Often Paired With

• IAT repair pigtail/connector (replace if brittle or oil-soaked)
• Intake horn gasket (if removed during service)
• Grid heater hardware (inspect while you’re in the area)

What’s In The Box

• (1) Genuine Cummins Intake Air Temperature Sensor (3918461)

Installation Tips

• Key-off and disconnect negative battery cable.
• Unplug the connector, remove the old sensor, and clean the port.
• Install the new sensor; tighten to spec. Reconnect and verify readings on a scan tool if available.
• If issues persist, inspect wiring, grounds, and check for boost leaks.

FAQ

WILL THIS FIT MY 1991.5–1997 5.9L 12-VALVE?

Yes—3918461 is the OE IAT for intercooled ’91.5–’93 trucks and ’94–’97 Ram 2500/3500 12-valve applications.

WHAT ABOUT 1998 TRUCKS?

Most 1998 12-valve builds use 3932272 instead. Compare your connector or verify by VIN/ESN.

WHAT DOES THIS SENSOR AFFECT?

It reports intake temperature to the control system, influencing cold-start, fueling, timing and grid-heater strategy.

WHERE IS IT LOCATED?

Threaded into the intake horn/plenum plate on the passenger side of the engine bay.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins 3918461.