NOx Sensors and Their Role in Control

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

NOx sensors enable closed-loop control of SCR systems and provide emissions monitoring for diagnostics.

Sensor Locations

  • Upstream — measures engine-out NOx for dosing calculation
  • Downstream — verifies SCR conversion efficiency

Efficiency Monitoring

Conversion = (Upstream - Downstream) / Upstream × 100%

Target efficiency: 85-98% depending on conditions.

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