Nox sensors

NOx sensors (Nitrogen Oxide sensors) continuously monitor the levels of nitrogen oxides emitted by the engine. This real-time data is sent to the ECU and AdBlue dosing system, enabling accurate urea injection to meet strict EURO emissions standards.

Typically located before and after the SCR catalyst, NOx sensors help evaluate raw emissions and assess the efficiency of the aftertreatment system. If these sensors fail, it can result in engine derating, warning lights, increased emissions, and system malfunctions.

Due to the extreme temperatures and chemical exposure, NOx sensors are prone to degradation over time. Replacing them proactively ensures optimal SCR operation and keeps the vehicle compliant with legal requirements.

Key features and uses:

• Measures NOx levels before and after SCR treatment

• Sends feedback to the ECU and AdBlue module

• Critical for maintaining correct dosing and emissions control

• Operates in high-heat, corrosive environments

• Available for a wide range of vehicle makes and models

At Sanders Parts, we supply high-performance NOx sensors engineered for precision and durability — ensuring your emissions system runs clean and compliant.