So I was getting a random engine light. I checked it and it was a secondary air injection fault. I looked it up and looked at others who've had the fault and a majority of them were saying it's prob a fuse or even a relay. So I pulled a bunch of fuses just to check and now I have all different sorts of faults coming up. Air bag, stereo system, tpms ect. Every time now the tmps light comes on saying system malfuction. What exactly should I look for? What do I need to replace? What could it be?