If problems persist after a reset, there are steps you can take. Issues like emission faults or a "no buss" message are challenging but not impossible to tackle. A common problem might be a short in the 5v power supply circuit. This fault stops the CCD bus from communicating. To find the culprit, you could disconnect sensors one by one. Check the 5v power supply circuit each time. Also, look for shorted wires or bad soldering on the PCM's circuit board.