P2448
AIR System High Air Flow Bank 1
The secondary air injection system on bank 1 delivers more flow than calibrated when the pump is commanded on - typically a stuck-open switching valve allowing free flow.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- AIR switching valve stuck openCommon
Parts involved
- Air System Pump B1
- Air System Switching Valve B1
P2448 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.