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Message: <blockquote data-quote="randymcg16" data-source="post: 313578" data-attributes="member: 10254">Unless they took a saw to your midpipe and cut the cats out and then welded replacement pipe it to span the gap I don't think they could have removed the cats. They are one piece along with the rest of the mid-pipe. If the h-pipe stayed then the cats stayed. There must be some miscommunication somewhere....According to my code book this is what these codes mean172- oxygen sensor indicates lean bank 1176- oxygen sensor indicates lean bank 2181- oxygen sensor voltage signal not switching: indicates lean at part throttle bank 1189- oxygen sensor voltage signal not switching: indicates lean at part throttle bank 2556- Fuel pump relaythis makes me think something is wrong with your fuel pump/fuel pump circut that is causing you to lose fuel. Maybe the boys at your shop bumped the wires or something while they were installing the catback. Might want to have a look before you go buying more stuff.</blockquote>