Check this first
Look for split intake hoses, a dirty air filter and loose sensor plugs first.
What usually fixes it
In the order a good shop checks them. Typical total: $114–$925 at $130 an hour.
Sensor plug or wiring
$114–$282A loose or corroded connector is the cheapest possible cause.
Air or fuel sensor
$144–$482Air flow, pressure, temperature and oxygen sensors all live in this group.
Vacuum or fuel supply fault
$228–$925A leak or weak fuel delivery shows up as a measuring fault.
This is the advice for this family of codes – Drive DTC doesn't have advice written for P0013 on its own yet.
Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.