2002 infiniti g20 v4 p0140 and p0455

Question

hi i have o2 infiniti g20 and the check engine is on with the p0140 and p0455 so i checked the gas cap and it has some crats so do i need to replace the gas cap and the sensor or only the gas cap ?

Answer 1

P0140  02 sensor circuit no activity detected bank 1 sensor 2

P0455 Evap system gross leak detected.

Lets start with the evap system yes it is the gas cap,if you have cracks in it you will have gas fume leaks,and with todays gas prices fumes matter,replace the gas cap it already has crack if this code comes back you dealing with a non sealing gas tank or evap hoses that contains the fuel, Now P0140 no activity,if you truly need a 02 sensorcode would of read high input circuit, p0140 no activity,in order for a catalytic to function properly it needs to go from lean to rich,you basically need to test fuel; control looking at data stream and fuel trim,so do you need a 02 sensor,I belive you need to check for tune up on this vehicle first.