1. This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. 2. If the real catalytic converter is damaged, the CEL eliminator can reduce toxic gases. 3. If the O2 sensor is too sensitive, the CEL will still be turned on after loading the canceller, which can not solve all the problems on the CEL alarm for the time being. It can only solve one of the P0420 code-fault catalytic converters. 4. Durable and reliable. 5. Material: iron
