P0065Air Assisted Injector Control Range/Performance
- 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
- Air-assisted injectors have an air sleeve around the nozzle tip: air flowing past at high speed breaks the fuel spray into finer droplets, which improves combustion and cold starts and lowers hydrocarbon emissions. On port-injected engines this air is taken upstream of the throttle and dosed by a pulse-width modulated bypass solenoid; because it bypasses the throttle, it is part of the idle air. The system is rare and mainly found on older engines. P0065 means the control is electrically in order, but the effect is implausible. One documented method compares the idle speed controller correction with the air assistance switched on and off during stable idle; if the difference is too large, the code is set.
- What you may notice
- Check engine light on
- Rough or unstable idle
- Poorer cold starting
- Likely causes
- LikelyAir-assist solenoid sticking or dirty
- LikelyAir hoses to the injectors leaking, disconnected or blocked
- PossibleAir passages at the injectors coked
- PossibleAir leak distorting idle control
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.