Fault codes

[Mark-Grandland]

Hi all,
Just had car on garage diagnostic check. Two fault codes logged, non vauxhall garage.
P20A2 Reductant Purge Circuit
P20E8 Reductant Low Pressure

Engine Management light comes on, followed by emissions fault. Emissions might stay on for 10 mins then goes out, if it stays out long enough EML then will go out after 3/4 cycles engine running. No deterioration of performance of car. Any advice welcome.

Car is Grandland X 1.5 diesel 2019

Thanks