FITMENT
Compatible with GM diesel vehicles equipped with SCR (Selective Catalytic Reduction) AdBlue emission systems requiring NOx monitoring.
Common applications include:

• Chevrolet Colorado (diesel variants where equipped with SCR system)
• GMC Canyon
• Chevrolet Express 3500
• GMC Savana 3500
  Using reference numbers:
• 55496923
• 55502092
• SNS0961 (sensor family designation)

Typically used in exhaust aftertreatment systems for emission control compliance (EPA diesel SCR systems).

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust system and sends real-time data to the ECU to control AdBlue/DEF dosing and reduce emissions.

Q2: Where is it installed?
A2: It is installed in the SCR exhaust aftertreatment system, usually before or after the catalytic converter depending on configuration.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/DEF warning messages, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Are 55496923 and 55502092 the same part?
A4: Yes, they are OEM reference numbers used for the same GM SCR NOx sensor depending on production or revision differences.