Product Overview

The MCT CH86AA NOx Sensor corresponds to OEM 68227486AA and is intended for exhaust aftertreatment systems that require direct measurement of nitrogen oxides in the exhaust stream. MCT states that its NOx sensors place a ceramic sensing element in the hot gas flow and use integrated electronics to process the signal and transmit continuous NOx data to the engine control unit over the vehicle data bus. This sensor forms a critical data source for emissions strategies in modern diesel platforms. Working with SCR catalysts and related components, this feedback supports precise control of exhaust gas recirculation, air–fuel ratio, and urea dosing to help keep NOx emissions within legal limits.

System Integration

According to MCT’s technical information, many applications deploy two NOx sensors—upstream and downstream of the SCR catalyst—so the control system can compare signals and monitor conversion efficiency. As part of a closed feedback loop, the sensor’s real-time measurements enable the ECU to adjust urea injection or trigger NOx storage catalyst regeneration as required, supporting emissions compliance alongside efficient combustion strategies. MCT highlights precise measurement capability and suitability across SCR-equipped passenger, light commercial, and heavy commercial vehicles as core characteristics of its NOx sensor range.

Service Notes

Use CH86AA where 68227486AA is specified and follow OEM procedures for installation, routing, and post-install diagnostics. Clearing stored fault codes and verifying ECU adaptation are recommended to restore proper aftertreatment control. Inspect connectors and harness routing for heat damage or contamination during replacement. The part is backed by a 1-year warranty.