Just got home, but on the way the EML came on. The car felt a bit lumpy and seems to have lost a bit of power. So I've just done a fault code read and it came back with:

0466 - Purge flow sensor range/performance.
0170 - Fuel trim malfunction (bank 1)

I'm guessing the second code is something to do with the fuel injector on cylinder 1? But I'm not entirely sure what I'm looking for as I've never worked on these engines before (Z18XE)

Any help would be greatly appreciated, cheers!