error codes - important or not ?

[rossa123]

Hi - I currently have two error codes on my 2001 Boxster and wanted to know in simple terms what they mean and is it necessary to have the car "fixed" - also if anyone knows what the "fix" procedure is.

the codes are P1128 Oxygen sensing adaptation area (cylinders 1-3) rich
P1130 Oxygen sensing adaptation area (cylinders 4-6) rich

Thanks for any help