Cel came on ran my scan tool and got code P0172 system too rich bank 1 ive done some research all ready I will be cleaning my maf sensor and I will be using fuel injector cleaner I did see online that it may be a faulty o2 sensor so I have a spare senor I could use I was just wanting advice on how to get this issue fixed , thanks I was bleeding my cooling system and shortly after the cel came on while idling

 

 

thank you for the troubleshooting refrence I'm sure it will help me !!