okay if it wont affect the performance any will it possibly affect my fuel economy? i had figured it would enhance the Performance/Fuel Efficency due to the engine running on cleaner gasses. I have also recently noticed a large loss in my mileage (such as about 90miles from toped off to half) running it nicely and i do not have any other codes other then the EGR (32) Acually i had busted off the o2 sensor after the cat and was still getting descent mileage then it droped around the time i put a new one in. Here is the deal tho i had an extra o2 sensor from my lebaron which looked identical to the old one so i installed that but i had cut the wires origonally so i respliced them togeather from the neon harness (wht to wht brn to brn blk to blk and wht to wht again) but i had wondered if the two whites acually had different functions and if i may have attached them incorrectly it seems as tho its correct due to no codes....