Factory Outlet SS304 Check Engine Light CEL Mini Catalyst O2 Sensor Spacer Adapter with all standard oxygen sensors with M18 x 1.5 O2 sensor holes. Straight bolt on, no modification needed, quick and easy installation to remove the check engine light. Features: This O2 solution has a miniature catalytic converter built into inside and will help you get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. Note: Please allow 0.1-0.5cm difference due to manual measurement. Please check carefully to make sure the item fits your car. your vehicle or not. If you are unsure if this part is correct, please email us and we will get back to you as soon as possible.