Industry leading throttle position sensor ( TPS ) manufacture in the automotive aftermarket. Walker Products TPS sensor is Manufactured for OE Fit, Form, and Function that it is worry free installation and performance you can trust Walker Products TPS sensor is Manufactured for OE Fit, Form, and Function that it is worry free installation and performance you can trust Symptoms of failure include poor starting, improper automatic transmission converter lockup, engine stumbling, stalling, and or a check engine light. There is no scheduled service for TPS sensors, sensors are non-serviceable and must be replaced when failure occurs OE Interchange: E5EF9B989DA, E5ZF9B989AA Vehicle Fitment Guide : Ford Aerostar 1987-1986, Escort 1986, LTD 1986-1985, Mustang 1989, Ranger 1988-1985, Thunderbird 1988-1985, Mercury Cougar 1986-1985, Lynx 1986, Merkur XR4Ti 1987-1985