OBD-II code · Powertrain (generic)
P0519 Idle Air Control System Performance
The idle air control system is electrically intact, but the actual idle airflow does not match the commanded value - typical for a sticky valve, intake leak, or carbon build-up around the throttle bore.
Is it safe to drive with P0519?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIAC valve sticking due to carbon
- PossibleIntake leak disturbs idle metering
Symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.8 h
- Emissions test
- Likely to fail
- Parts involved
- Idle Air Control Valve, Intake Manifold, Throttle Body
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.