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What is a NOx sensor?
NOx sensors monitor the level of nitrogen oxide emitted by a diesel vehicle to ensure compliance with emissions regulations. Most engines feature two NOx sensors: an upstream and downstream sensor. Common causes of failure include soot buildup on the sensor, ECU water intrusion, damage to the cable, sensor damage due to high temperature etc...


How the NOx sensor works
The NOx sensor measures the level of the SCR state, to do this it needs exhaust fluid (AdBlue-DEF) to activate the SCR. ECU-DCU controls the pump and fluid dispenser based on data coming from the sensor. With the heat of the exhaust gases, Adblue will decompose into ammonia and carbon dioxide.
If too much Adblue is injected into the exhaust, the SCR catalyst can become saturated with ammonia. For a NOx sensor, ammonia and NOx look the same and it reports the wrong amount of NOx in the exhaust stream. When the exhaust Catalyst - DPF - FAP gets clogged with ammonia the ECU-DCU stops dosing and injects Adblue-DEF so the destruction of the catalyst itself becomes inevitable.
The sensor itself also fails due to the high temperature in the already damaged and clogged catalytic converter, and replacing the sensor with a new one does not solve the problem.
How is it removed the NOx sensor?
Self-removal of the sensor is not always possible, in many cases, the AdBlue-DEF system should also be removed.

Is NOx Sensor Removal Legal?
There are cases where it is necessary to completely remove the NOx Sensor. Complicated repairs in which to find the problem it is necessary to temporary removal of the NOx Sensor, competition vehicles, special purpose vehicles, etc.

The removal of the NOx Sensor is at the customer's discretion!
Chip Cars offers global software modification services in various countries around the world. The user must consult the legal regulations in their country.