OBDII Not Ready HELP!! (Cant Pass Inspection)

[c4m]

Hey guys I'm having an issue with my 2005 300c AWD with 45,000miles. I recently took my car to NJ State inspection and failed for OBD Not Ready. I have a diablo predator with a 93 octane tune and had gotten the inspection done with my tune on. As soon as I failed I automatically figured it was the predator tune. So I went back to stock and went to inspection again but I still ended up failing. At this point I am still running with my tune off and figured maybe I needed a full drive cycle untill the OBD becomes ready. Searching around on the board I found that if you wait 15 seconds with the key position to on if the CEL blinks it means OBD is not ready. I've driven at this point over 300 miles and my OBD is still not becoming ready. My next step is simply to take it in to the dealer, but being an 05 with 45,000 miles im sure none of this will be covered under warranty. Before I do this I wanted to get some help, advice, or suggestions from my fellow LX members. HELP! Any info is much appreciated and thanks in advance.

[dpshook]

check the fuse for the power. I dont know which on it its. also have you tried to unplug the battery and let it reset?

[c4m]

Sorry I forgot to leave that out. I actually did leave my battery unplugged overnight and reconnected in the morning to do a "full reset" of everything.

[PowerWagon896]

Sorry I forgot to leave that out. I actually did leave my battery unplugged overnight and reconnected in the morning to do a "full reset" of everything.

DO NOT DO THAT!

Everytime you do a reset it will reset the not ready condition.

[dudeiwin86]

yea dude.
you have to drive like 50 miles on the car to get it to learn read all the sensors.

if you reset anything it will give NOT ready.
if you wrote a tune, or went back to stock.. NOT ready, it starts over.

go drive for a while, do 75 mph in 5th gear
then do traffic, or light to light
different types of driving finish it faster.

check with the Key to see if the CEL blinks, if it doesnt, then go get inspected.

[c4m]

After failing the second time for not ready I decided to do this. As I said earlier I've driven over 300 miles since unplugging the battery. I mean just continuing driving may resolve the issue but I guess only time will tell. But I would think 300 miles should be sufficient for the system to become ready, but I can be wrong..

[PaCharger]

took me 3 key cycles getting to temps, about 18 miles.

[PaCharger]

do you have the temp code turned off in your tune? o2 sensors? give us some other details....

[Carfinish]

read this ... should help you a lot

http://www.lxforums.com/board/showth...31#post2058431

[c4m]

I did not make any other changes with the predator besides the 93 octane tune and the typical quick adjust settings. And again about 300 miles ago I went back to my original backup so the car is now back to stock.

[Hemi31]

Do you have a colder T-stat?If the car does not maintain 167*and above for the entire test cycle it will not test for ready status.I know most people have 180* T-stats but if it's cold out then it is possible not to maintain 167*+.Also you need to maintain highway speeds for some distance.I would bet your Thermostat is the culprit.....also you didn't mention if you had an engine light,if you do it's an instant fail.

[c4m]

I have not changed out the T-Stat. I bought this certified used from the dealer so it is possible that the previous owner changed it. But I have no way of knowing. I do get the "coolant not reached optimum temperature CEL" (I forget the code number) from time to time that I simply clear with my diablo. But I dont know if this means anything.

[Hemi31]

p0128?That would be the t-stat.If the temp needle is not on the center line or above on the highway you have an aftermarket t-stat.If it's about a 1/4" off to the left of center you might have a 170* and you'll never get to ready without really working at it.

[c4m]

Yes its the p0128. With the colder weather it does take a little while but it does eventually get to the middle line or at least very close to it.

[Hemi31]

Easiest thing for you do do is go buy a stock t-stat,put it in,go drive 100 miles and pass inspection.You can put the cooler t-stat back in for the summer.