Woulda been nice if Tips For Newbies! One more question: what is a drive cycle? The best part? If they do reappear, then address them and keep driving around until your vehicle becomes ready enough for an emission check; if it is not in that stage of readiness, there is a good chance that your car will automatically fail! Chat with like-minded Frontier owners. Note that the engine temperature must be above 176F. We offer a wide range of services like AC repair, brake repair, belt and hose replacement, four wheel drive repair, tire rotations and more. b[1].height = "469" Your thermostat opens in the 176-183F range. Other issues may include worn spark plugs, defects in the evaporative emission control system (EVAP), leaks, a defective light (warning) on the dashboard and a Damaged catalytic converter. However, it also states that the engine should be allowed to idle until it reaches operating temprature before taking it out for the drive cycle. kept malfunctioning. me drive it 100 miles for computer to calibrate/ve driven 300 miles please After, you will need to drive. OBD2, or onboard diagnostics, is a system of sensors and computers that monitor and control a vehicles operations. You might also want to consider going to a small independent place which might have workers who are more familiar with older cars than the folks at a large corporate establishment. We hope these details we give can work well for you.