P0065
Air Assisted Injector Control Range/Performance
Auxiliary emissions / air-assist injection
Generic OBD-II
High
What it means
P0065 means the air-assisted injector control system isn't performing within its expected range. On engines that have it, this system adds air to improve fuel atomization for cleaner combustion, mainly at cold start. A fault — often a clogged injector, a weak solenoid, or its circuit — shows up as a rough cold idle and higher emissions rather than as a no-start.
High
Can I keep driving? Usually yes — this mainly affects cold-start emissions and smoothness; you may notice a rough cold idle, but it rarely strands you.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle, most noticeable when cold
- Slightly reduced performance
- Higher emissions
Common causes
Most likely first
- Clogged or dirty air-assist injector or its air passagesLikely
- Failed air-assist injector or control solenoidCommon
- Open or short in the air-assist injector control circuitCommon
- Loose or corroded connector / damaged wiringLess often
- ECM fault (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to confirm the operating conditions.
- Inspect and clean the air-assist injector and its air passages if clogged.
- Test the injector / control solenoid and its circuit for correct operation.
- Repair damaged wiring or connectors in the control circuit.
- Replace the air-assist injector if it fails testing; consider the ECM only after the rest checks out.
FAQ
Quick answers
Is it safe to drive with P0065?+
Generally yes. The air-assist system improves cold-start atomization and emissions, so a fault mainly shows up as a rough cold idle rather than a driving hazard.
Can I just clear P0065?+
It returns until the injector, its air passages, or the circuit is repaired.
Related codes
Often seen with P0065
Read & clear P0065 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX