Ok so my check engine light came on the other day and sincie my car is due for inspection i took it to my garage to see if it would pass. These are the codes that the comp read out. P0161 02 heater fault P0156 02 circut fault P0402 EGR Excessive flow P1405 DPFE sensor upstream problem P1270 engine RPM speed limiter reached what do all these mean??? How can i fix them and how much will it cost. The guy before me put in a speedometer callibrater i think so that could be the " rpm speed limiter reached "