What is an Air-to-Fuel Ratio Controller (AFRC) and why do I need to use one with a TWC?
An AFRC is an electronic controller that maintains the correct air-to-fuel ratio to help a three-way catalyst perform oxidation and reduction. An AFRC includes an oxygen sensor as a feedback mechanism and a fuel control valve. CleanAIR Systems offers several different controllers. Engine specifications and application needs are taken into account when recommending the correct AFRC for the job. A TWC depends on an AFRC to maintain the proper balance of air-to-fuel. Without an AFRC, a three-way catalyst may not achieve desired reductions.
