There is an integrated miniature catalytic converter in the O2 CEL fixture, which helps to eliminate this annoying by light inspection of the engine after changing the exhaust gas or removing the catalytic converter, and sometimes even when installing a high-flux catalytic converter. The problem. Should not seize the opportunity just because the length usually does not work, this is an actual integrated miniature catalytic converter. The O2 CEL curing of this small cat will make your ECU think that the catalyst converter is still installed. When it removes the catalytic converter, the O2 sensor will see an increase in temperature and an increase in unburned fuel flow. For this reason, to check the engine light (CEL SES DTC), the typical error code is P0420 (a catalyst for system efficiency below the bank 1 threshold) and/or P0430 P0420 (a catalyst for system efficiency below the bank 2 threshold), only use For off-road use Size: external thread M18 x 1.5 internal thread M18 x 1.5 length 46.5mm Weight: 40g Function: Check engine light repair Colour:silver Material:Metal Package Contents: 2 * Connector Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.