OKI ES4191 Error Codes list and solutions – Compatible Printer model: OKI ES4191 – OKI ES4191 Error Code description: Code: 002 … 005 Display: Power OFF/ON 002 : Error – 005 : Error Description: CPU Exception Troubleshooting Guides: Is the error display provided again? Yes Turn off and on the MFP. Replace the CU/ PU […]