I had a code for multiple misfire in July and fixed that aroudn the beginning of August and reset the ECU. The codes haven't come back and the car runs fine. But I've gone to test my emissions and now, two months later, it still says the ECU is "not ready to test". That usually only takes like 50 or so miles and I've driven it much more than that. Is there something that could go wrong with the ECU to make it do this? Thanks for any help.

 

Bump...anyone?

 

Did you leave it in dianostic mode? You turned the screw all the way back to the right.