DENSO Auto Parts 234-5104 Air / Fuel Ratio Sensor. Air/Fuel Sensor 5 Wire, Direct Fit, Heated, Wire Length: 12.60. Laser welded stainless housing resist corrosion and PTFE filter blocks contaminants under harsh engine conditions. Dual-layer protection shields the ceramic element, ensuring proper conditions for fast and reliable response times. DENSO Air/Fuel Ratio Sensors are manufactured and tested to the strictest OE standards for unparalleled peformance.; Each component is precision-built for exact replacement… and a first time fit.; DENSO gives you the right part and the right fit… the first time.