Working temperatures are of great importance for service life of the oxygen gauge and каталитического neutralizer. To too heats react both the oxygen gauge, and the catalyst too sensitively. For example, when not burnt down rests of a working mix ignite in the catalyst (fault in ignition system), the internal temperature can reach dangerous level. Long influence of temperatures to 1200 With much reduces catalyst service life, and at temperature 1400 With плавится its ceramic case and the oxygen gauge also overheats. You can find out the fused catalyst on the characteristic hissing sound of the exhaust gases caused by raised resistance to pass of gases. Establish the reason faster and eliminate it.