Product Description
Interstate-McBee M-3408345 Intake Air Temperature (IAT) Sensor – 1998.5–2002 5.9L Cummins 24-Valve
Quality aftermarket replacement IAT sensor for Dodge Ram 2500/3500 with the 5.9L Cummins ISB (24-valve) from mid-1998 through 2002. The IAT sensor monitors incoming air temperature so the ECM can manage fueling and timing correctly. Sold individually.
- Direct replacement: OE-style connector and tip for straightforward install.
- Stable readings: Accurate response across typical intake temperature ranges.
- Durable build: Designed for diesel under-hood environments.
- Value: Interstate-McBee performance at an affordable price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3408345 |
| OEM Reference | Cummins 3408345 |
| Function | Intake Air Temperature (IAT) sensing |
| Connector | OE-style plug (vehicle-side harness) |
| Sold As | Each (1 sensor) |
What’s Included
- (1) Intake Air Temperature Sensor, P/N M-3408345
- Packaging and basic installation guidance
Vehicle Fitment
Always verify by engine serial number (ESN) or VIN where possible.
- Dodge Ram 2500/3500 with 5.9L Cummins ISB (24-valve)
- Model Years: 1998.5, 1999, 2000, 2001, 2002
Symptoms of a Failing IAT Sensor
- Hard starts, poor cold-weather drivability
- Reduced fuel economy or power loss
- Check engine light with intake temp correlation codes
- Erratic IAT readings on scan tool
Install Notes
- Disconnect the negative battery cable before service.
- Locate the IAT sensor in the intake tract (varies by model year/airbox setup).
- Apply a light film of dielectric grease to the connector seal if desired.
- Do not overtighten; follow factory torque specifications.
- Clear any stored codes and verify readings on a scan tool after installation.
Recommended/Related Parts
- Map/Boost Sensor (for complementary diagnostics)
- Air Filter (ensure proper airflow and accurate IAT)
- Harness Pigtail/Connector Repair (if existing plug is damaged)
Why Buy From CPP Diesel
- Diesel-focused support and ESN-verified fitment help
- Fast shipping and straightforward returns
- Extensive inventory for 5.9L Cummins maintenance and repair
FAQ
Will this fit my 1998.5–2002 5.9L Cummins?
Yes—this listing covers the 24-valve 5.9L Cummins ISB used from mid-1998 through 2002 in Ram 2500/3500 trucks. For edge cases, confirm by ESN or VIN.
Do I need to replace anything else at the same time?
It’s a good idea to inspect the MAP sensor and intake tract for contamination and ensure the air filter is clean. Replace damaged connectors as needed.
Will this clear my check engine light?
Replacing a failed IAT sensor can resolve related fault codes, but always scan, clear codes, and verify that the issue was the IAT and not wiring or another sensor.
