read your codes like for a cel and erase them using the erase function?If so there is the problem it will set all the I/M monitors to not ready.It is part of the non constant emission monitoring system.Even if you had to take a smog test if you have no cel on, you can get by with 2 i/m status codes not ready,and eventually it will after enough proper drive cycles reset itself.
Or if you cleared the codes and need to take a smog test and i/m are not ready,follow----with common sense----
This generic OBDII drive cycle
Begin with a cold start (coolant temperature below 122 degrees F and the coolant and air temperature sensors within 11 degrees of one another). This condition can be achieved by allowing the vehicle to “sit” overnight, and then by beginning the drive cycle the next day. Most drive cycles will be difficult to follow exactly under normal driving conditions, so the driver should exercise caution, road safety, and courtesy to others.
* Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on.
* Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle.
* Hold at a steady speed of 55 mph for three minutes.
* Decelerate (coast down) to 20 mph without braking or depressing the clutch.
* Accelerate back to 55 to 60 mph at ¾ throttle.
* Hold at a steady speed of 55 to 60 mph for five minutes.
* Decelerate (coast down) to a stop without braking.
As long as your other cat is okay,and it would let you know
no reason to be afraid