Review on 🔧 Motorcraft DY992 Oxygen Sensor: Enhanced Performance and Durability by Jordan Epps

Perfect for my 2004 F150 XLT 5.4L 4x4 with 140,000 miles. I use OBD-II software through my iPhone and an OBD-II Bluetooth adapter to regularly monitor my truck's health. Lately I've been noticing some wobble and acceleration issues and the software was showing erratic readings on my up sensors and a constant zero voltage on both of my down sensors. Fuel trim also works to enrich from time to time (from -12 to -21). MPG figures also dropped to an average of 11.5 MPG with 20-inch off-road wheels and 35-inch mud tires. I first checked and ruled out vacuum leaks, exhaust leaks and no misfires in all cylinders. The spark plugs are 5 months old and the CS is 1 month old. About a week ago I disconnected the battery overnight and changed the upstream sensors the next morning. I completed the PCM relearn procedure by driving 35 miles (city and highway) for 30 minutes. While the truck's performance improved slightly, fuel economy increased by 0.5mpg. When the downstream sensors arrived today, I followed the same install and relearn procedure and drove the truck for 101 miles, combining city and highway driving. The truck runs much better with more acceleration and an average of 14.2 mpg. Also, the fuel trim is back to normal and the STFT and LTFT are running within +/- 10 readings. The downstream voltage readings are back to the 0.6 average where they should be. This confirms that downstream oxygen sensors are affecting the performance of my truck and MPG. Some say it doesn't affect me, but it did for me.