You need OBD2 reader or scanner to get the codes
Click the link.
exhaust gas recirculation flow insuficient
you needs a dpfe sensor
Trouble code P0768 means: Shift solenoid D electrical problem
Trouble code P0171 means:System too lean (bank 1)
P0455 code for mazda Protede... Evaporative Emission System Leak Detected (gross leak/ no flow)
You get a OBD II reader (http://www.nextag.com/obd-ii-code-reader/search-html), which will read the code, tell you what the problem is, and if desired, reset the check engine light. If you don't fix the problem,however, you are not guaranteed that the light will go away permanently.
Trouble code P0170 means:Fuel trim malfunction (bank 1)
Trouble code P0400 means:Exhaust gas recirculation-flow malfunction
Trouble code P0420 means:Catalyst system efficiency below threshold
code 1195 is dealer specific if you look up code 0195 it is more general but will tell you what the problem is