Need the Vacuum Valve?
this is the dreaded P0491,p0492 secondary air faults you will see in your car. this can be one of many things, things to look at are: air pump check to see if it’s working. check the hose from the air pump to the check valve and see if it has a hole. the check valve could be bad, check the vacuum lines back to the vacuum valve and see if there is any holes. and finally if you did all those checks then the vacuum control valve is the issue. it’s actually is a fairly easy job a bit awkward but doable.
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