And the worst news is that Nox sensors are not cheap to replace. Nox sensors are especially likely to fail on a regular basis. With all these complicated nox and scr systems comes many problems. Some governments around the world have passed laws to limit their emissions. NOx gases can cause various problems such as smog or acid rain.
The drive to develop a NOx sensor comes from environmental factors. Depending on the SCR system, another NOx sensor may be installed in front of the SCR catalytic converter. This is mostly common with Euro 4/5 standard vehicles. Vehicles can also be fitted with two nox sensors. (different from one manufacturer to other) the vehicle will enter limp mode. Should such fault/error be detected, vehicle ECU will start limp mode timer, and, after a certain number of hours, starts etc. If excessive NOx or ammonia concentrations exist at the SCR outlet, an OBD malfunction/fault will be triggered, as NOx sensors are sensitive to both gases. To satisfy various OBD requirements, SCR systems typically use a NOx sensor downstream of the SCR catalyst. The most recent area of NOx sensor application are SCR systems for light and heavy duty diesel engines. The development of exhaust gas NOx sensors started in the 1990s. NOx – a nitrogen oxide sensor is a high-temperature device/sensor built/designed to detect nitrogen oxides in combustion environments such as an automotive or truck exhaust emissions.
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