P0420 Live Test - Bad Oxygen Sensor? (1 Viewer)

[volinky]

Had a P0420 pop up with a check engine light/VSC OFF/TRAC light. When I ran a Techstream live test, this is the graph on an engine rev at about 3500rpm. Can anyone tell me if this confirms the Bank 2 Sensor 2 oxygen sensor is bad? I believe the threshold is something like 0.49, and it looks like this is going above that mark.

 

[JunkCrzr89]

0.4-0.55 is normal for O2 sensor. However, P0420 is for bank 1, not bank 2. Your bank 1 sensor looks like it’s dead.

See here: http://www.ezdries.net/Vidpics/4Run... Engine Control System/SFI System/0060037.pdf

 

[2001LC]

Try playing with fuel trims in tech stream utility. Run it max rich, that max lean. You'll then see if BK 1 sensor reacts.