Helo my name is brett. I just bough a honda civic yesterday and at first there was no check engine light but the it came on while cruz done the road. It resets everytime i turn off the car but comes back on when im driving. I have tried to jump the connection fo the trouble code but the connecter doesnt seem to work. Need help with asap im thinking its o2 sensor but not sure

 

Welcome to the forum and congratulations on your purchase! Hope your issues get sorted out quickly and painlessly! Post some pics so we can see what you're working with.