650NutKase

I have a p0420 code but I know the cat isn't an issue since I have a straight pipe in its place with the non fouler mod done to prevent CELs. It has been good for about 20k miles then I got a p0420 today. Does this graph make any sense??? Looks like bank 1 is running fine but bank 2 is all weird?? Bad o2 sensor? Btw, the rear bank 1 sensor stays leveled out at about .6 volts even at idle...

F150Torqued

I've spotted your problem.

The little 'CAR' in the upper right indicates your Vehicle Profile is not set up right for a TRUCK!!!! You need to change the icon for your profile!!! LOL. JK.

Seriously, it's not confusing. Torque Pro confirms your P0420 code. The code is generated when O2 voltage switch ratio between rear and front O2's (during the OBDII catalyst monitor routine) are below a predetermined ratio (60% - 75%) depending on exhaust configuration, 'Y' pipe etc.

Your switch ratio for bank 1 is "ZERO" (that's definately P0420). According to Torque Pro switch count (little red circles) bank 2 appears OK with 3 switches to 4 upstream switches. That of course depends on present driving conditions - as per the rather narrow OBDII Catalyst Monitor entry conditions. - (ECT normal, Mid-bed inferred cat temp > 1300 degrees, light cruise (35-45 mph), light load (?? %), no breaking or decel, etc).

My interpretation: If you have straight pipe with fouler mod. Check the fouler hole is not plugged up or obstructed, or otherwise O2 B1S2 is not switching like one would expect with NO CATALYST to store oxygen. According to B1S1, the fuel/air ratio is definitely changing.

650NutKase

Must have had some carbon fouling in there...took the o2 off, banged on it some to loosen up anything that may be in there, tightened it back up. CEL turned off by itself, did not have to use torque to turn it off.