i was working on my mazda 3 , you know maintenance and all, i noticed an issue with the ecu, so i thought to check it out, finally reset it, just to find out the engine lights kept going off, i had to check the internet because heck where is a repairman going to find help about car faults, lol this blog seemed helpful so im posting it here
https://www.ecudoctors.com/pages/ecu-faults