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Typical NOx sensor failure symptoms would be identified with a warning (MIL) light and diagnostic tool plug in. Other symptoms of failure could be voltage spikes or vehicles entering a de-rate mode.
NOx sensors probes cannot be cleaned effectively enough to allow reuse of them although it doesn’t stop people from trying, it isn’t recommended.
Typically the NOx sensors are covered under vehicle manufacturers warranty or parts warranty if the product has been purchased in the aftermarket.
No, all NOx sensors are not the same, the fundamental product material in terms of a probe, body and PBC are the same. However, the programming and parameters set by the OEM is the key in differentiating the sensors from each other, not just its physical differences.
Majority of the industries NOx Sensors are manufactured by Continental in collaboration with NGK.
NOx sensors typically fail due to excessive carbon exposure and build up over a period of time. However there are other reasons for failure this would be the major cause of failure.
NOx sensors are located before (Upstream) and after (Downstream) the CAT (Catalytic Converter).
The smart Nitrogen Oxide Sensor (NOx) is built to detect high levels of nitrogen oxides within the exhaust emissions of a vehicle. The sensor feeds back intelligence to the ECU of the system, this includes the NOx level measurements during a duty cycle. If the guideline parameters are not met an emissions light will appear on the vehicles instrument cluster, forcing operators to investigate and take action.
There are a few reasons behind sensor failures, however the main reason is the condition of the vehicles engine. Regular servicing is paramount for ensuring the carbon output is as low as possible. Low carbon output reduces the likelihood of premature sensor failures due to carbon clogging of the sensor probe.
Regular maintenance servicing such as oil changes and valve clearance are key to ensuring longevity.
Running vehicles with emissions failures will cause unwanted attention from local authorities, therfore it is key to resolve the issues as quickly as possible and avoid prosecution.
