Citan system readiness issue

The 'System readiness check incomplete' message often appears after an OBD2 scan, especially if the car's computer hasn't had enough time to re-run all its diagnostic routines. I had a similar issue with my old BMW after clearing some codes. The car needs to complete a 'drive cycle' for all the readiness monitors to set. This involves specific driving conditions that allow the computer to test various systems like the exhaust system and catalytic converter.

Right, a 'drive cycle', got it. So, what exactly does that involve? Is there some kind of magic formula I need to follow? And how long does it usually take? Should I just ignore the check engine light and hope it goes away?

The drive cycle varies depending on the manufacturer, but it generally involves a cold start, idling for a specific period, followed by steady-speed driving on the highway and city streets. However, if the error is still present, I recommend going to a trusted workshop. It is likely that you need a computer reset of the car diagnostics system.

Thanks a lot! Turns out you were spot on. I took it to the local garage, they did a computer reset. Cost me absolutely nothing! The error is gone and the check engine light is off. I will try to avoid cheap OBD2 dongles in the future.