How to fix error code P0302,P0015,P0128,P0304 for this car? Model:S40;

Here is a link to error codes for Volvo s60

https://www.google.com/amp/s/www.trouble...

Does your car actually have problems ?

P0302 is misfire in cylinder 2 , with a LOT of potential issues ( sparkplugs, injectors…). But if your car doesn’t currently seems to be having engine problems , it is possible that these are older codes for problems that happened once in the past.

for example… could have had some dirty bottom of the tank gas and created one random misfire.

Often one problem links to others and generate other codes.

if your car doesn’t have problems . I would suggest your clear The codes, and run the engine like that. Check your codes frequently, and not the first one showing up. If they happen more or less at the same time And quickly after the engine runs , you likely have an Issue, but come back here and let us know, with more infos and symptoms.

good luck