P0491 — Secondary Air Injection System Insufficient Flow Bank 1
Severity: Warning
Can you drive? With caution: limp mode possible, have it checked soon
Make: All makes (OBD-II standard)
| Meaning | Secondary Air Injection System Insufficient Flow Bank 1. |
| Family | Powertrain (P) |
Frequently asked questions
What does code P0491 mean?
Secondary Air Injection System Insufficient Flow Bank 1. Secondary Air Injection System Insufficient Flow Bank 1.
Can I keep driving with code P0491 active?
With caution: limp mode possible, have it checked soon
How do you fix code P0491?
Diagnosis starts from reading the live ECU parameters: the code points to the fault area, not to the part to replace. A vehicle-electronics specialist can test the component and clear the code after the repair.
Need help with this fault?
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Where to get it fixed
Related codes
- P0400 — Exhaust Gas Recirculation Flow Malfunction
- P0401 — EGR: insufficient recirculation flow
- P0402 — EGR: excessive recirculation flow
- P0403 — EGR control circuit
- P0404 — EGR: control circuit range/performance
- P0405 — Exhaust Gas Recirculation Sensor A Circuit Low
- P0406 — Exhaust Gas Recirculation Sensor A Circuit High
- P0407 — Exhaust Gas Recirculation Sensor B Circuit Low
- P0408 — Exhaust Gas Recirculation Sensor B Circuit High
- P0409 — Exhaust Gas Recirculation Sensor A Circuit
- P040B — EXHAUST GAS RECIRCULATION TEMPERATURE SENSOR 1 CIRCUIT PERFO...
- P040C — EXHAUST GAS RECIRCULATION TEMPERATURE SENSOR 1 CIRCUIT LOW