Size: external thread M18 x 1.5 internal thread M18 x 1.5 length 60 mm 1.Built in the micro catalytic converter, avoid checking engine lights after modifying exhaust or removing catalytic converter. 2.There is an integrated miniature catalytic converter in the O2 CEL fixture, which helps to 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. 3.The problem Should not seize the opportunity just because the length usually does not work, this is an actual integrated miniature catalytic converter. 4.The O2 CEL curing of this small car will make your ECU think that the converter is still installed. When it the catalytic converter, the O2 sensor will see an increase in temperature and an increase in unburned fuel. 5.For this , to check the engine light (CEL DTC), the typical error code is P0420 ( for system efficiency below the bank 1 threshold) and/or P0430 P0420 (a for system efficiency below the bank 2 threshold), use For off road use. 4 x parts. Mini-catalytic Converter Sensor Automotive Accessories Mini-catalytic Converter Car Accessories 4PC *Made of high quality material, durable and practical to use Please believe in the quality of our auto parts products. Our store already has a good review and BS-labeled auto parts product, with monthly sales of more than 400 pieces.I assure you that this product is as good as that one.If you don't like this product,you can also click into my store to buy that hot-selling product. 💌If You Have Any Questions about The Item, Plz Contact Me by Email and I Will Reply ASAP.Best Wishes💖