This blog deals with OBD Not Ready:http://obdnotready.blogspot.com/
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OBD test check for faults and these are "p" series codes once the light has come on it stores them and a freeze frame when the faults has occur. Once the technician has repaired the fault they clear the code from memory . But now the car must test itself to see if the repair was proper. this is know as monitors. once the proper criteria is meet the monitor goes from incomplete to complete. and each key cycle counts as a trip or drive cycle so several trips are needed to get all monitors to completion. And if a battery has be changed they start at incomplete. if you know what monitors that have not passed i can tell you how to get them to run.
There are many systems that need to be ready for the obd testing. for example the catalyst has to be ready and the evap. system needs to be ready if more than one of these systems are not ready the machine will fail you at this time. then they will tell you to usually come back in a week or so after the vehicle has been driven and they will test the vehicle again for FREE of charge. also if you just recently had any work done and they cleared the codes from your vehicle this will delete your obd system ready lights, which will cause the same outcome.
SOURCE: Car failed inspection because of the check engine light
to ideas come to mind, maybe a bad bulb in the dash (you can take this out (depending on mechanical knowledge)
or find a smaller inspections shop and try taking the car in again in hopes of that they won't catch it
SOURCE: 2000 Saturn SL2 fails smog due to failure of OBD Self test
Some vehicles require very specific drive cycles (called "drive traces"
if you perform them on a road simulator or dyno) to activate certain
self-checks like the catalyst and EVAP monitors.
As a general rule, doing some stop-and-go driving around town at speeds
up to about 30 mph followed by five to seven minutes of steady 55 mph
highway speed driving will usually set most or all of the monitors.
Consequently, if you're checking an OBD II system and discover that one
or more of the monitors have not run, it may be necessary to test drive
the vehicle to set the remaining monitors.
You should talk to a good emission tec, if this is not throwing a code, it is hard to say if that one of the components could be bad. O2,pump,convert, HeO2, every part of the emission system.
With a 1000 miles, and doing what is says above just before the test, and ending driving at the test
should be plenty. If it is not, you will have to have each emission part checked, or when the computer
is plugged in it might show a code that did not trip dash light.
SOURCE: OBD CONNECTION 2000 NISSAN FRONTIER
if the scanner will not communicate with the ECm, First check all the fuses under the hood. If all is well, make sure you have the key on and not off or running. If all is good there then the computer for the car has taken a vacation on you and will need to be taken to the dealership for repair/re-programming.
SOURCE: Did not pass state inspection (vehicle)
First the fault codes,
U110C is No Fuel Level Bus Message
U0155 is No Cluster Bus Message.
Unfortunatly you have to be able to communicate with the instrument cluster with your scanner to diagnoise and I do not think an aftermarket scanner can do this.
SOURCE: The check gas cap light keeps coming on. I have
leak in the evap system usaly a dry rotted hose under vehical
Testimonial: "Thans I'll check it out."
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Usually answered in minutes!
This brief video explains succinctly what the issue is and how you can avoid this in the future:http://obdnotready.blogspot.com/
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