Specification: Type: Oxygen Sensor Thread: M18 X 1.5 Color: As the pictures shown Material: 304 Stainless Steel Fitting Type: Direct Replacement Surface Finished: Chrome Features: CEL eliminator (someone call it Mini cat). General model is suitable for most cars. Built-in M18X1.5 catalytic converter, helps to get rid of checking engine lights. DESIGN TO FIT MOST VEHICLE WITH THE M18X1.5 O2 SENSOR HOLE. OVER 99% SUCCESS RATE EVEN ON EXOTIC CARS AND EURO CARS. Built in micros catalytic converter, avoid checking engine lights after modifying exhaust or removing catalytic converter. This O2 cel fix with miniature cat will trick your ECU into thinking the stock catalytic converter is still installed. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flows of unburnt fuel. As a result this will throw check engine lights (Cel, SES, DTC) typically the error codes will be P0420 (System Efficiency Below Threshold Bank 1) and/or P0430 P0420 System Efficiency Below Threshold Bank 2). But for OFF ROAD use only Package Included: 1 x O2 Sensor Adapter