I had like 4 codes originally... Well i just got my new rear o2's on and mil eliminators no more check engine light til i went down the road... I WAS NOT HAPPY! Well i got it checked and their scanner didnt give me the numbers it went across EGR Pressure Sensor... Well they remove em when they do that so i plan on taking it for another drive tomarrow and if no code... INSPECTION AND EMISSIONS HERE I COME... If it throws same code i will have to buy one auto zone sells it for like 52 bucks... Any other help and what is this thing???