FITMENT:
Compatible with Ram heavy-duty trucks equipped with 6.7L Cummins diesel engines and SCR (AdBlue/DEF) emission systems, including:

• Ram 2500 (2013–2015)
• Ram 3500 (2013–2015)
• Ram 4500 (2013–2015)
• Ram 5500 (2013–2015)

OEM reference number: 68085740AA (also 68085740AB / 68085740AC supersessions in some catalogs).

Used in diesel exhaust aftertreatment system for NOx monitoring (SCR system).
This version is commonly the downstream (post-catalyst / outlet NOx sensor) for 2013–2015 Cummins applications.

FUNCTION:

• Measures nitrogen oxide (NOx) levels after SCR catalyst
• Sends data to ECM/ACM for DEF dosing correction
• Ensures emissions compliance (EPA diesel SCR system)
• Helps prevent derate and SCR efficiency faults

INSTALLATION POSITION:

• Downstream (outlet) NOx sensor in SCR system
• Mounted after SCR catalyst in exhaust line

FAQ:

Q1: Is this inlet or outlet sensor?
A1: This OEM 68085740AA is typically the downstream (outlet) NOx sensor for 2013–2015 Ram Cummins SCR systems.

Q2: What trucks does it fit?
A2: Ram 2500 / 3500 / 4500 / 5500 from 2013–2015 with 6.7L Cummins diesel engines.

Q3: What are symptoms of failure?
A3: SCR warning light, engine derate, incorrect NOx readings, AdBlue system faults, or limp mode.

Q4: Is 68085740AA interchangeable with AB?
A4: Yes, AB is an updated supersession in many applications.

Q5: Does replacement require programming?
A5: Some trucks require ECM reset or SCR adaptation after installation.