P0065

Air Assisted Injector Control Range/Performance

Q: 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.

Q: Can I just clear P0065?

It returns until the injector, its air passages, or the circuit is repaired.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0065 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX