I know this is an old thread, but if your truck has an aluminum sensor, only use the Aluminum one (Tomco or motorcraft)
. The new plastic ones may appear better but they use different technology and put out a different signal voltage which is lower than the good ones which will cause the code to come up again. For me I bought the truck used ('97 f150 4x4 4.6L VIN code 6) and it came with the plastic sensor and had the EGR insufficient code, so I went Autozone and bought the sensor but still had the code. I have now completely replaced the EGR system (EVR, EGR Valve, tube, vacuum line, and hoses going to the sensor) and still have the code. Bought the Tomco 10906 and that solved the problem.