I have a 1500 Exoress van, 2012 with 75K on the clock. I replace the bank 1 post cat 02 sensor. I have driven the HECK out of it and 4 mionitors have reste 3 have not. They are: 02 sensor, o2 sensor htr, Evap. Or at least that what my scan tool is telling me. So, just keep driving??? I need this carzy thing to pass inspection In have a long trip coming up next week and it HAS to pass!!

 

I would always replace all the 02 sensors at the same time to be sure.

 

have they run, failed and set dtc or just not run?

 

OK, here's the update... Finally there was some action. the engine light came back on and now there was a code P0056I cleared all codes and started again. 2 hours later I came home and my scanner said there is a code Poo54 ( no light on yet. )So now I am totally lost!!

 

check the o2 heater fuses
check for the o2 sensor wiring harness rubbing on the frame rail. they rub through the loom and short out. follow from the sensor back to the main harness connector.

 

Some good news..... There was in fact a short as the wire rubbed through. I healed that up and made it so it should never happen again, cleared the computer and started driving again. I now have 0 codes and 6 monitors " ready " one monitor not ready yet, " EVAP ".Drove about 100 or so miles. " EVAP " still not ready. I need the low down on this. I need it READY and then go get my sticker as Saturday morning I am headed out on a trip. I will take any advice I can get!!!

 

it will take some time for all the evap monitors to run, some of them require the vehicle to be shut off for 8hrs or a temperature fluctuation over a set time to run.

 

fuel level must be between 1/4 and 3/4 or the evap monitor will not run.
google evap drive cycle or evap monitor for model year.