P2399Subaru OutbackYears: 1996 - 2026
Secondary Air Injection System (P2399)
Reviewed by ASE Certified Technician
What does this mean?
Code P2399 relates to the secondary air injection system variants.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Subaru Outback models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty secondary air injection pump
Stuck secondary air injection check valve
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Failed emissions test
- Rough or unstable idle