So I just picked up a 2002 Z06 this past Friday and I went to the DMV today for inspection, upon which I failed. On the paper that I was given, the explanation for failing is, "Based on information obtained from the OBD system, the system is not ready to determine the status of the pollution control system on this vehicle. To continue with the inspection process, the vehicle's OBD system must be ready for testing upon reinspection. See the vehicle owner's manual for information on 'OBD/Readiness Driving Procedures' or contact your vehicle service provider." Now I was looking through my manual and I found an article on page 2-90 about "Emissions Inspection and Maintenance Programs". I saw that it mentioned about the CEL, of which mine works properly. I noticed that the fourth paragraph states "Your vehicle will not pass this inspection if the OBD system determines that critical emission control systems have not been completely diagnosed by the system." Also, I noticed that near the end of the same paragraph there was another statement saying, "The OBD system is designed to evaluate critical emission control systems during normal driving. This may take several days of routine driving. If you have done this and your vehicle still does not pass the inspection for lack of OBD system readiness, see your dealer or qualified service center to prepare the vehicle for inspection." So I don't know if my cats are bad, or I just need to drive the car for a little bit more. If anyone can help me it would surely be appreciated. Thanks!!

 

It sounds like someone may have cleared the codes before you picked up the car. If the check engine light was on and the codes were cleared you will need to dirve the car. I had a similar situation due to a CARB legal mod that was not working properly. Once I got the correct tune and cleared all the codes I drove the car for about 100 miles before taking it in to Smog. It passed fine.

Checked the codes before you take it in if you are still throwing engine related codes you will need to get those addressed before it will pass.

 

Okay, I understand that. Now, on the paper that the DMV gave me, it shows for "OBD SYSTEM - DIAGNOSTIC TROUBLE CODES PRESENT" that there were no codes present. Also, after having picked the car up on Friday, I've driven it for about 300 miles. Should something have come up already?

 

yeah something should have came up.. i cant really speak for new jersey but same thing in cali. if codes have been cleared or the battery has been taken off the computer has to go thru a process of re-learning things. once its done all that its clear to be smogged. if there is still no check engine light you should be fine.

 

If you clear the codes, it will take some time for the computer to re-learn, which causes a not ready issue at the emissions station. Once certain conditions are met the computer will connect with the emmission station, and if there are no power train module codes set it should pass. Run the codes, but do not hit the reset button. If codes are present, fix them.

 

In the paper they gave you does it state which systems are not ready? Also does the car have cats or any mods?

You could always find someone with HPTuners and force the systems ready

 

The readiness status shows as follows on the paper:
Engine misfire - ready
Fuel system - ready
Comprehensive component - ready
Catalytic convertors - not ready
Heated catalytic convertors - unsupported
Evaporative system - ready
Secondary air injection - not ready
A/C refrigerant - unsupported
Oxygen sensors - ready
Oxygen sensors - heaters - ready
EGR system - unsupported

The exhaust wasn't touched on the car. Just a high rise hood, Hurst shifter and chrome C5Z wheels. Nothing that pertains to emissions.

 

Sorry for my ignorance with this emission stuff, but this is the second time I've ever done this. The first time was with my old '94 and that passed so this is the first time that a vehile has failed on me. I appreciate everyone's help!

 

Read this:

http://www.obdii.com/drivecycle.html

If you have long tubes, the cat test will never initiate.

If that test doesn't run the evap test won't.

Then you won't pass because of two "failures".

I burned through about $300.00 worth of gas before I realized I was never gonna pass those tests.

 

Seriously?! That's lame

 

Where did you get the car, dealer or private party? Was the battery changed? For example, if the dealer installed a new battery that would be a good reason for the not ready status on several OBD II tests because they all reset.

Also, I know Autozone will read the codes, not sure if they also get the status. That would save a return trip until the car is ready to pass.

 

It definitely sounds like the battery was disconnected or someone cleared the codes before purchase. Do as someone else said and go to advanced, autozone, etc and get a free obd scan, see if theres codes, and go from there. You could always do as I stated before and just get someone with HPTuners and have them force the rediness tests and be done no headaches, no bs. Im kinda close to you if thats an option youre interested in just pm me.

 

I got it this Friday, the 21st, from Bruce's Auto Mall in Pennsylvania. He sells pre-owned Corvettes. He didn't change the battery on it. Looks like I'll have to go to Autozone and see what's wrong

 

Take this offer.

Even my car will pass emissions testing.

 

How do you force the tests in HPTuners. I can turn codes off in the tuner and do different testing in the scanner, but I didn't see anything that would force those checks to be passed.

 

If you turn off ALL the DTC monitoring, the computer defaults to a passed state for the tests.

Not an advertised "feature".

 

Good to know.

 

There most likely nothing wrong. If any codes are cleared OR battery disconnected all the I/M monitors (the thing you FAILED) also get reset. Cheapy actron type scanners will let you see the status of these monitored tests. After a reset, it generally takes a few days of normal driving (and letting the gas tank get BELOW 1/2 full) for all the tests to run.

 

Cool. That's what I suspected but I put catted headers on and left the rear O2's in the pipes so I've never tried turning off the cat check codes and it passes the tests anyways. Most likely, this area is changing to an ODBII port check instead of the tailpipe sniffer so knowing this might come in handy next year.

 

Didn't know that... Cool.