With the Hyundai i10, P0404 is -

EGR code P0404 · When Monitored: Engine running · Set Condition: The EGR flow or valve movement is not what is expected A rationality error

Detailed information on troubleshooting and repairing a p0404 automotive trouble code which refers to an EGR circuit range or performance issue Also includes

p0404 EGR code P0404 · When Monitored: Engine running · Set Condition: The EGR flow or valve movement is not what is expected A rationality error

p0404 Default Re: Please help with gwm error codes P0404 and P2264 P0404