The purpose of a MIL (malfunction indicator light) Eliminator is to turn off those annoying "check engine" lights on today's modern OBDII equipped vehicles. If you are a performance auto enthusiast and you're seeing those MIL lights more than you think you should, the are a few reasons behind it. If your car is used exclusively on the race track, you've probably removed the catalytic converter, for one thing. Alternatively, you may have a worn or damaged catalytic converter or O2 sensor. Generally, drivers that have modified a vehicle for the race track or speedway will want a BBK MIL Eliminator Set installed. The BBK MIL Eliminator Set is designed to be wired into the rear O2 sensor wires. It fools the vehicle's computer into thinking that the catalyst system is functioning properly by regulating the voltage sent back to the vehicle's computer from the O2 sensors. Installation of a BBK MIL Eliminator Set will prevent this annoying code from triggering your check engine light. It's important to keep in mind that the BBK MIL Eliminator Set does not prevent the MIL from illuminating under all circumstances. It is for performance race cars that have had the catalytic converter removed. It that's your case, install a BBK MIL Eliminator Set today. All our customers certainly deserve professional technical support when looking at high-quality car parts. To support that need, we maintain a 24/7/365 assistance call center to answer all your calls. To make a good deal even better, we always offer totally free shipping for all orders $50 and higher. If you spot a lower price elsewhere, tell us - we will beat any advertised price for auto parts.