If your Chevrolet Blazer failed the emissions test due to high NOX, the EGR Valve is most likely the issue. If your Chevrolet is running rough or has poor fuel mileage, replace the Blazer EGR Valve and gasket.
Do not buy the cheap no name remanufactured or rebuilt Chevrolet Blazer electronic control units, as in our experience most of these ecu’s don’t even work right out of the box. We also carry programmable Chevrolet Blazer control units from AEM that allows you to custom program your Chevrolet Blazer ignition and fuel system.
Replace your faulty Chevrolet Blazer Mass Air Flow Sensor with a Genuine or OE Bosch Unit to keep your Chevrolet running like new.
The Chevrolet Blazer Oxygen sensor is a critical part of the emmision control system and should be replaced as soon as it fails. Make sure to check the Chevrolet Blazer diagnosics codes for proper replacement of the O2 Sensor.