went to emmisions and failed due to a system readiness fail. just came back from my buddys house and hooked it to his more advanced obd2 scanner and it said the same thing. trying to figure out where to look to get the problem fixed, electrical issue or ecu messed up.

 

Did you disconnect the battery recently, or have any sort of service done recently?

 

replaced battery friday, also i noticed i had a melted coil to distributer wire today almost all the way threw insulation. replaced with a spare i had. what does disconnecting battery the battery do? ive done it in other trucks with no adverse affects b4. checked fuses and didnt see any blown

 

I fail emissions a few months ago for the same reason. The Catalytic Converter and Oxygen Sensors were in a 'Not Ready' state. Whenever the battery is disconnected or the PCM flashed, the vehicle has to go through a drive cycle (different versions of what that really is) to put the sensors in a ready state to give off a code. They said to simply drive the truck for about 150 miles and bring it back in and it the sensors should be ready. Drove it a couple of hundred miles, highway driving has to be involved, and passed inspection on the next try.

The sensors have to be in a 'ready' state, so you simply cannot disconnect a battery to get rid of the check engine light (to pass emissions) which will come back later on. Just drive it and try it again, that should take care of it.

 

guy said the same thing and the truck wouldnt start the other day either lol i think connector problems so another couple hundred miled to go, i didnt want it to be like a shot ecu. thanks i shall report back when its all set

 

well looks like ive gotton to the miles where the sensors are talking, chk eng light has popped 2 times in the last 2 days, it cleared itself. ive been holding off but ill replace the o2 sensor when i get a dry garage. emmisions is so stupid

 

Same thing happened to me...and as soon as it was ready the light popped up and i needed to replace the same thing.

 

stupid light keeps going on if i let it run for a bit. it went off again this afternoon so ill try to get it over there after work. this is just plain dumb

 

Do you know which code or codes are triggered?

 

preaty sure p0138 and p0141 o2 sensor bank 1 sensor 2 i think high voltage and heater thing. went today and passed w/o replacing anything yet, waiting on better weather to work on it. still snowing and raining near me. now just trying to figure out if i need to replace the alternator. also thanks for the help