Yeah - you do that. Read off the warning code when you do, and post it back to the forum for discussion. Remember the code is indicated by flashing indicator lights and the engine warning light itself flashing. You can look up the meaning of the code from the
http://www.sr20de.net site so that you know what to expect. If you fitted an exhaust header you may have a problem with the sensor fitting for example. The other guys know a lot more about it than me!