[header] How to clean an oxygen sensor [title] Protect your hands and eyes. [step] Since you'll be dealing with gasoline and various car parts, it's important to protect yourself from potential harm. Before you begin to lift your car and locate the oxygen sensor, put on a sturdy pair of work gloves to protect your hands. 
You should also wear a pair of protective eyeglasses or goggles in case any wd-40 or gasoline comes near your eyes. [substeps] Both work gloves and protective eyewear can be purchased at your local hardware store, or at a large retail store such as a walmart.