I recently put my cats back on to smog my car but the service engine light comes on. I disconnected the battery but still came on. What do you guys think the problem is? My car runs really good. I know it's probably a sensor. I need to dyno it soon or no tags. anybody know a good dyno place in los angeles? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />