Hey all, I was having this issue lately with my SE 2011 Challenger where my smog wasn't passing due to catalytic oxygen sensor not ready for the OBD2. Below is the drive cycle that gave me an indication of the MIL of a steady light when checking if OBD2 is ready or not, which steady light means it is ready and if it starts to blink it is not ready. I hope this info will help anyone that is having the same issue. Drive vehicle, preferably on flat highway, at steady speed. Before drive cycle verify the following - fuel level should be between 15% and 85%. engine temp greater than 158°F, and engine run time greater than 92 seconds. Drive vehicle and maintain speed around 70 mph, keep engine speed between 1200-3000 RPMs, and keep MAP between 7.5 - 15 Hg. No hard acceleration or stopping. Drive at least 5 miles under these conditions and upstream O2 monitors should run. Next drive at 70 mph constant for at least 5 minutes. Lift foot from accelerator pedal and decelerate to 55 mph without hitting the the brake. Repeat this for at least two times. Next, bring vehicle to a stop and let vehicle idle for one minute. This should now pass downstream O2. Lastly, turn vehicle off and remove key. The posting of the monitor is done at power done. Wait two minutes, turn the key back on. You should now be ready. To verify readiness without a tool plugged in, turn key to the run position and observe MIL. The MIL will bulb check solid, go off then blink after 15-20 seconds if the vehicle is not ready. If the ready the MIL will stay on solid forever. If the drive cycle is followed exactly as stated and it does not pass, perform a capacitive discharge to reset all the modules and try again.
