This Car Truck SUV unit eliminates both 4-wire narrowband and 4-wire wideband air fuel sensors. The Car Truck SUV oxygen sensor simulator will allow you to run without catalyst converter and still keep the service engine soon light off. It supplies the Engine management with mimic, fluctuating voltage signal and tricks the ECU thinking the emissions are normal. The only solution is to install a Wideband O2 sensor simulator wired up to the downstream lambda probe’s harness in order to simulate a properly functioning O2 sensor. Obviously you do not want to drive your Car Truck SUV with a constant ECU warning light, in addition your vehicle will not pass emissions inspection in many areas with an illuminated warning light. The modified engine now produces a larger amount of exhaust gases than allowed. When aftermarket headers are installed or catalytic converters are eliminated, the result is a catalyst efficiency engine management warning light MIL code indicating that the catalyst is missing or not working properly. Nowadays, vehicles are fitted with two up to four oxygen sensors, at least one upstream sensor that controls the fuel management system, and at least one downstream that monitors converter function. What the wideband O2 controller does is provide the control circuitry required to drive the sensor itself - and will usually have an output to drive a display and an interface to a narrow band input on an ECU.A popular alteration to tons of performance enthusiasts is to remove, gut or hollow the catalytic converter or to install aftermarket header, to free up performance potential of the vehicle. On a modified engine, especially one that is being setup for the first time, the tuner will have only a rough idea as to where the mixture settings should be - a narrow band O2 sensor in this application will only tell him lean or rich, but not how lean or how rich, wheras a wide band sensor will provide that information.
Narrow band O2 sensors are less expensive than wideband and as a result much more common, but, because of their narrow range they provide less information to the ECU, which is not normally a problem on a standard or unmodified engine, because the mixture requirements are reasonably well established.
The term "wideband O2 controller" is a bit of a misnomer - in that the device does not control the O2 in any way - think of it as a "wideband O2 sensor controller".
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