Toyota CHR System Readiness Check Issue

It is possible that the OBD2 diagnostic tool interrupted the readiness monitors' self-testing. This can occur if the tool was disconnected prematurely or if the vehicle's system wasn't allowed to complete its diagnostic routines. Were all vehicle systems in a ready state prior to your scan?

That's interesting. To be honest, I didn't check if all systems were ready before scanning. Is there a way to get the system readiness back to normal without going to a mechanic, or is a computer reset needed?

The situation does indeed suggest an interruption of the OBD readiness cycle. While some drive cycles can help reset the monitors, the safest approach would be a visit to a workshop. They can perform a proper system reset and verify the exhaust system's functionality.

Thanks for the info. I cleared the error memory with the scanner and did a longer drive. All systems went to ready after that. So basically, no repair cost at all. All good now!