NOx Sensor Diagnostics

A NOx code does not mean the sensor is bad

Deep diagnostics for upstream and downstream NOx sensors — and how to prove the failure instead of throwing parts at it.

1. 1.Upstream & Downstream NOx Sensors
2. 2.Sensor Communication & Plausibility
3. 3.Sensor Response & Heater Operation
4. 4.Wiring & Connector Problems
5. 5.Sensor Contamination & False Readings
6. 6.Comparing Upstream/Downstream Behavior
7. 7.SCR Efficiency Calculations Conceptually
8. 8.Proving a NOx Sensor Failure