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Message: <blockquote data-quote="NCMystic" data-source="post: 788169" data-attributes="member: 11397">My car has expired plates and inspection. I took it to get inspected and everything passed save it throwing a few codes. It's telling me i have a misfire, 02 sensor slow response code (x2) and that it's running rich. The car drives fine, as far as i can tell from driving feedback i can't tell that there is any misfire. The only mods to the car are long tube headers, offroad H, flowmasters and a built clutch. There are no cats on the car but it does have the MIL deletes and is not throwing any codes for no cat or the converters not working properly. I bought a bottle of Seafoam but has not used it yet as i didn't know if i should put it in the gas tank, vacuum line, oil, or a combination. I have cleared the codes and driven it very nicely and the codes continue to come back. I have tried cycling the codes out multiple times to no avail. I have very little money to spend on my car at the moment so new cats or o2 sensors are out of the question basically. I know others out there have had this problem and i have pretty basic mods. Can someone please tell me how to take care of this as cheaply as possible. All i need is for it to pass, i know someone out there has the answer so please help me out guys.(Mods; please do not move this thread to 4v tech where no one will read or comment, i need as many peoples' input as possible.)</blockquote>