Car CEL Fix Check Engine Light Eliminator Oxygen O2 Sensor Protective Shell Plug Adapter M18 x 1.5 Feature: 1. Don't take a chance on using an extension only as often they do not work. 2. This O2 cel fix will trick your ECU into thinking the stock converter is still installed. When you remove your converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. 3. As a result this will throw check engine lights (Cel, SES, DTC) typically the error codes will be P0420 (Catalyst System Efficiency Below Threshold Bank 1) and or or P0430 P0420 - Catalyst System Efficiency Below Threshold Bank 2). For OFF ROAD use only. Specification: Material: Stainless steel Color: silver Thread: M18x1.5 Length: 46.5mm or 1.83" Function: check engine light fix Note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. 1 X Car CEL Eliminator