Oxides of Nitrogen sensors (NOx) are mainly used in the emission systems of diesel engines. Their function is to detect the levels of Nitrogen Oxide that are expelled by the exhaust, once they are burned in the combustion chamber. Since Nox sensors are exposed to hostile conditions, they are made of ceramic and zirconium.
The Engine Control Module (ECM) calculates the nitric oxide and nitrogen dioxide gases, according to the values provided by the Oxygen (O2) and Oxides of Nitrogen Sensors (Nox). With this, the ECM regulates the levels of nitrogen oxides coming out of the exhaust, preventing damage to the atmosphere.
When the diagnostic code P2210 OBDII is set, it means that the ECM has encountered a problem with the output level of the engine’s bank 1 Nox sensor detection circuit. This is specifically because the reading levels are excessively below the programmed range.