Hello hotel2zero, thanks for your question in the autoaid community.
The fault Code C1201 means a fault from the catalytic System.
Check the EGR Ventile, it could be coked and the following fault comes then.
Clean the EGR Ventile and erase the fault Code, sometimes the cataltic converter is fault and must be renewed..
Toyota plays a new Software on the Control Unit, because this fault comes from a faulty EGR channel.