Use only Acura OE quality replacement Catalytic Converters to keek your Acura CL in the best running condition. DriveWire sells only California legal CL OBD-II Converters.
If your Acura CL failed the emissions test due to high NOX, the EGR Valve is most likely the issue. If your Acura is running rough or has poor fuel mileage, replace the CL EGR Valve and gasket.
Do not buy the cheap no name remanufactured or rebuilt Acura CL 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 Acura CL control units from AEM that allows you to custom program your Acura CL ignition and fuel system.
The Acura CL 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 Acura CL diagnosics codes for proper replacement of the O2 Sensor.