P2448
AIR System High Air Flow Bank 1
Secondary air injection
Generic OBD-II
Low
What it means
P2448 means the engine computer detected higher-than-expected air flow in the bank 1 secondary air injection (AIR) system, often from a valve stuck open or the air pump running when it should be off. This system works mainly during cold starts to reduce emissions, so the fault does not affect how the vehicle drives.
Low
Can I keep driving? Safe to drive. Secondary air injection mainly affects cold-start emissions, so the vehicle runs normally, but it may fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- No noticeable change in how the vehicle drives
- Occasional rough or higher idle right after a cold start
- May fail an emissions/readiness test
Common causes
Most likely first
- Secondary air switching/control valve stuck open on bank 1Likely
- Air pump running when it should be off (stuck relay or control)Common
- Failed or misreading AIR flow/pressure sensorCommon
- Vacuum or control line leak at the air control solenoidLess often
- Corroded or loose wiring/connector in the AIR circuitLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm when the excess air flow is detected (should be only during the cold-start test).
- Check the secondary air switching/control valve for sticking open.
- Verify the air pump and its relay shut off when commanded.
- Inspect control vacuum lines and solenoids for leaks or faults.
- Test the AIR flow/pressure sensor against spec, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2448?+
Yes. The secondary air system operates mostly during cold starts for emissions, so it does not affect normal drivability. Repair it to clear the light and pass an emissions test.
Can I just clear P2448?+
It returns during the next cold-start test unless the valve, air pump, or sensor is repaired.
Related codes
Often seen with P2448
Read & clear P2448 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