my check engine light has just come on whilst out driving about
how do i figure out the codes to work out the source of the problem?just recently had a new o2 sensor fitted could it be something to do with that?

 

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Reading ECU Fault Codes

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / ECU Reset

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Subaru Specific Trouble Code Definitions

 

cheers,i have done that any the error code im getting is 22 which is knock sensor?what does this mean and is it serious?will resetting the ecu get rid of the problem?

 

it might do, depends on whether it failed or whether it detected too much knock. Does the cel light come on all the time you are driving, or is it clear then after a while, or hard accel, come on??

 

seems to be on all the time,good thing or bad thing?

 

Probably means your knock sensor has failed. If it was me, I'd change it ASAP as this detects detonation and worse case scenario could mean bottom end damage.