Emissions
 

I have done some emissions work on my 2001 deville. I cleared codes in the computer, how many miles do I have to drive the car or hours,or key ons do I have to go thru before the computer recalibrates and I can take the vehicle back to be emission tested again.

what did u do
what were your readings

I had a code for air injection system error. I replaced the spark plugs, the air injection relay, and air injection solenoid

Thanks for all the help I have just found a bad check valve by doing a vacuum test.