FITMENT
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2007-2012 Dodge Ram 2500, 3500, 4500, 5500 with 6.7L Cummins Diesel engine.
Interchange Part Numbers:
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5149085AC, 5149085AB, 5149085AA
DESCRIPTION
Product Overview
- Engineered to Mopar’s latest 5149085AC specifications, this EGT sensor integrates three successive factory engineering revisions to maximize signal durability and internal junction integrity. It seamlessly serves both pre-DEF and DEF-equipped emissions architectures at the same physical position without altering core thermocouple performance.
- By incorporating field-driven updates in calibration precision and long-term voltage stability, this AC-spec replacement delivers a direct, plug-and-play upgrade—restoring clean ECM communication, clearing fault codes, and preventing premature engine power derates.
Key Features
- Precision-tuned thermal response curve aligns seamlessly with factory ECM voltage tables across the complete temperature spectrum—from cold starts to sustained full-load EGTs.
- Incorporates the latest Mopar AC-level engineering updates, optimizing internal thermal junction integrity to deliver long-term signal stability without voltage drift.
- Factory-matched immersion depth places the sensing tip directly in the primary exhaust gas stream, eliminating border-layer temperature lag without restricting high-RPM exhaust flow.
- Engineered to withstand the specific, low-frequency harmonic vibration patterns of Cummins inline-six diesels, preventing internal junction separation under continuous highway hauling.
FAQ
Q: What changed between the AA, AB, and AC revisions of this sensor?
A: Mopar updated this sensor through three engineering revisions to enhance signal integrity and internal junction longevity against thermal shock. The current AC-spec directly replaces legacy AA and AB variants with full backwards compatibility, offering superior long-term calibration stability while maintaining identical physical and electrical specifications.
Q: Can I test this sensor with a multimeter before replacing it?
A: Yes. With the sensor disconnected, measure resistance across the signal terminals. A healthy sensor typically reads within the factory specification range at room temperature. An open circuit (infinite resistance) indicates a fractured internal junction, while a short circuit signifies thermal element degradation. In either condition, the sensor must be replaced.
Q: Does this sensor affect how the truck behaves during parked regeneration?
A: Yes. The Cummins ECM requires verified temperature data from all EGT positions to execute a parked regeneration safely. If this sensor sends an out-of-range or missing signal, the ECM will inhibit manual regen commands, leaving the DPF prone to soot overloading until a functional sensor is installed.
Q: Can a 6.7L Cummins sensor fail from moisture alone, without heat damage?
A: Yes. Moisture intrusion into the terminal connection is a leading cause of signal degradation, often leading to terminal corrosion and false temperature codes on low-mileage or idle vehicles. Ensuring the harness connector is completely latched during installation prevents water ingress and restores circuit continuity.
Q: Need a different sensor position for your 2007–2012 Ram?
A: The 6.7L Cummins runs multiple EGT sensors. We also carry the 68002443AB (2007–2009) and 68206021AA (2010–2021). Match the part number on your old sensor.
