The three-way catalytic converter has been cleaned, but the fault light is still on. How to solve this problem?

The three-way catalytic converter has been cleaned, but the fault light is still on. How to solve this problem? Sanyuan has been cleaned (see transaction price | vehicle details), but the fault light is still on. How to solve this problem? Generally, the cleaning of three-way catalytic converter must combine throttle and nozzle. First of all, understand the meaning of fault code. If the catalytic converter is inefficient, it may be catalyst poisoning and needs to be replaced. What fault light is it? What kind of car does the landlord own? @20 19