Sensors and switches

NOx sensor

The VOLTREK NOx sensor measures nitrogen-oxide concentration in the exhaust so the engine and the SCR system can keep emissions within limits.

VOLTREK NOx sensor with control module and harness

The NOx sensor measures the amount of nitrogen oxides in the exhaust gas. On diesel engines with an SCR system the control unit uses this value to meter AdBlue and to verify that the catalyst is working. An inaccurate sensor leads to wrong dosing, warning lights and, on some vehicles, a power limit.

VOLTREK NOx sensors are designed for signal accuracy across the full exhaust temperature range, stable communication with the control unit and direct fitment with the original connector.

For availability, OE cross-references and trade enquiries, contact us by email.

Frequently asked questions

What does a NOx sensor do?
It measures nitrogen oxides in the exhaust stream and reports the value to the engine control unit, which uses it to meter AdBlue into the SCR system.
Where is the NOx sensor located?
There are usually two: one upstream of the SCR catalyst and one downstream, each with its own electronic module on a cable.

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