P0099Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Intake air temperature sensor 2 is the second air temperature sensor in the intake path; on many turbocharged engines it sits in the intake manifold, often combined with the manifold pressure sensor, and is used to calculate cylinder filling and ignition timing. For P0099, the signal jumps faster than a real temperature can change, which typically points to a loose contact.
- What you may notice
- Check engine light on
- Usually no noticeable symptoms
- Emissions test or readiness check may fail
- Likely causes
- LikelyLoose contact or wire broken by movement
- PossibleSensor failing intermittently
- RareInterference on the signal wire
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.