i have a 1998 chevrolet blazer with 192,000 miles. tune ups oil changes regular and good upkeep. went to get vehicle inspected and it failed. tech showed the not ready status on egr,heated o2, and catalyst. i work 2 miles from the shop and was told that vehicle may not have had time to perform ob2 self test. no check engine light has come on (mil bulb) working. no battery change or jumpstart since 2008. never heard of drive cycle, is this someting for real ??? was told i might drive for twenty-thirty miles and come back for retest and status might change. any thoughts help would be greatly appreciated. North Carolina Inspection thanks

 

It's quite real and works wonders. GM Drive Cycle.

 

Yes, it's for real! In the real world, I've seen vehicles go for months and not complete every monitor. Here is a link to the GM drive cycle. It must be followed EXACTLY or the monitors will not run and complete their tests. You don't have to do every step in the cycle, just the ones that aren't complete. Read through it and do the ones that have not completed. With some practice, you can do the entire drive cycle in about 15 minutes.

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

 

thanks for everything guys. will do driving cycle tomorrow and go for reinspection.

 

Is it getting up to the proper temperature as this will prohibit the monitors from running. Jerry-just a random thought...

 

drove from work to inspection station. less than 2 miles. outside air temp 34 degrees. hopefully engine did not gethot enough to go to ready status. just a thought would bad parts, egr o2 sensors create not ready status regardless of how long driven or following drive cycle guidelines. no codes read from autozone scan tool

 

Some monitors require a cold start, others require the engine to be at operating temperature. If a part has a hard fault, it will set a DTC immediately. Go through the drive cycle, if it's followed correctly, all monitors will run and complete their tests.

 

thanks for your help. just didnt want to throw money for new egr,o2s,cat,etc muucho deniro.

 

don't spend any more money at this point, just drive it. Maybe since the last battery disconnect/jump, you haven't driven an hour or so at any point? Seems strange but I've seen some strange ones. Follow the drive chart-you should be ok. Is he temp getting up to around 195? Jerry

 

Under those conditions the engine will not reach operating temperature and will still be in 'open loop' condition. Until it goes into 'closed loop' your OBD system will not be showing all sensors to be in 'ready' ststus.