Details

• Brand:

  

• SKU:

  40009741

• Positions: Front Lower Lower, Front Lower Right, Lower, Lower Right
• Description:

  GM part 40009741 is a NOx (Nitrogen Oxide) Sensor Assembly.

  Key details:

  • Type: Exhaust emissions sensor (NOx sensor)
  • Function: Measures nitrogen oxide levels in the exhaust stream so the engine control module (ECM) can adjust emissions and DEF/SCR system operation
  • System location: Typically mounted in the exhaust aftertreatment system (SCR catalyst area), depending on application

  Important note:

  • GM part 40009741 is a replacement/supersession part
  • It replaces GM part 24000237 (NOx Sensor Assembly – Position 2)

  Common usage: This sensor is used on GM diesel applications with SCR emissions systems, including select:

  • Chevrolet Silverado HD / Sierra HD (Duramax diesel)
  • GMC Sierra / Yukon HD variants (diesel-equipped)
  • Other GM diesel platforms using urea (DEF) aftertreatment

  Because NOx sensors are position-specific, correct fit depends on whether it’s:

  • Upstream (pre-catalyst) or downstream (post-catalyst / position 2)

  If you want, send your year, make, model, engine (or VIN) and I can tell you exactly which position and whether 40009741 is the correct one for your truck.

  
  

• Replaces:

  24000237, 40009362

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