P0519 code meaning
Idle Air Control System Performance
Powertrain system Generic code P05xx codes Check engine light
What P0519 means
P0519 means the idle control fails functionally with an electrically sound circuit – the actual idle speed deviates strongly despite fully used control. It is documented only on Subaru (also in the Saab 9-2X, electronic throttle, around 2005): idle at least 1000 rpm above target with the control already at zero for 2 or 5 s sets the code with the warning lamp at once, and a fail-safe cuts fuel to cylinders to stop the engine racing. GM and Ford use P0506/P0507 instead; CARB's mandatory limit is +200/−100 rpm.
P0519 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0519
- Idle far above target, engine races
- Jerking from cylinder cut-off in limp mode
- Check engine light on
Common causes of P0519
- Most likelyFalse air behind the throttle (intake, gasket, vacuum hose)
- Most likelyThrottle or idle valve stuck open (foreign body, coking)
- PossibleThrottle actuator motor faulty (follow-on P2101)
- PossibleFollow-on fault of other codes (sensors, pedal)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Idle controlThrottle bodyEngine control module
What each part of P0519 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 19 | The exact fault in that area. |
What to do next
- Note P0519 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0519
What does P0519 mean?
P0519 means "Idle Air Control System Performance". P0519 means the idle control fails functionally with an electrically sound circuit – the actual idle speed deviates strongly despite fully used control. It is a generic code, so it means the same on every make.
Is it safe to drive with P0519?
Drive gently and only to a workshop. With P0519 the car can go into limp mode (reduced power) to protect itself.
Will P0519 fail an emissions test?
Yes, it can. P0519 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0519 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0519 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.