garajizOBD-II code · generic
P0491
Secondary Air Injection System Insufficient Flow
- System
- P0 — Powertrain (generic)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P0491 mean?
P0491 is defined as “Secondary Air Injection System Insufficient Flow”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Related codes
- P0492Secondary Air Injection System Insufficient Flow
- P048FExhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/Erratic
- P048EExhaust Pressure Control Valve A Position Sensor/Switch Circuit High
- P048DExhaust Pressure Control Valve A Position Sensor/Switch Circuit Low
- P048CExhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/Performance
- P048BExhaust Pressure Control Valve A Position Sensor/Switch Circuit
Look up another code
This page is general information; an exact diagnosis needs measurements and a technician’s check.