Fitment

Fits for:

• Cummins diesel engines with SCR (AdBlue / DEF) emissions systems
• Heavy-duty trucks (Kenworth, Peterbilt, Freightliner, International)
• Engine platforms: EPA10 / Euro 5 / Euro 6 SCR applications depending on configuration
• Also used in some Hino / Scania / OEM-adapted SCR systems (cross-platform applications)
• Position: Exhaust NOx sensor (inlet or outlet depending on system layout)
• OE / Cross References: 5WK97103 / A3C0656990001 / SNS503 / SNS703 family / 4326870 / 2894943 / 2871974 / 5WK9 7103 series

FAQ

Q1: What is 5WK97103 used for?
A1: It is a NOx (nitrogen oxide) sensor used in SCR diesel emissions systems to measure exhaust NOx levels and help control AdBlue (DEF) injection for emission compliance.

Q2: What engines use this sensor?
A2: It is commonly found in heavy-duty diesel engines across multiple OEM platforms, including Cummins-based systems used in trucks and buses with SCR aftertreatment.

Q3: Is this inlet or outlet sensor?
A3: It can be used as either upstream or downstream NOx sensor depending on SCR system configuration and ECU calibration.

Q4: Is 5WK97103 interchangeable with SNS503?
A4: Yes, SNS503 is a cross-reference designation used for the same NOx sensor family in compatible SCR systems.