Attention:
Light instrument failure is a warning, and it relate to the whole engine and the car circuitry, so it can not be often lights all the time. So we need a O2 sensor spacer to let it not lights.
Fault Codes usually:
P0420, P0421, P0422, P0423, P0424, P0430, P0431, P0432, P0433, P0434