P0491 — Secondary Air Injection System (Bank 1)

Powertrain (engine/transmission)

Secondary Air Injection System (Bank 1)

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Can I drive with P0491?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code P0491 mean?

P0491 means Secondary Air Injection System (Bank 1).

Can I keep driving with P0491?

You can usually drive home and book an inspection within a few days.

Related fault codes

• P0490 — EGR Control Circuit High
• P0492 — Secondary Air Injection System (Bank 2)
• P0493 — Engine Over Speed
• P0494 — Fan Speed Low
• P0495 — Fan Speed High
• P0496 — Evaporative Emission System Purge Flow During Non-Purge
• P0497 — Evaporative Emission System Purge Flow Low
• P0498 — Evaporative Emission System Vent Valve Control Circuit Low
• P0499 — Evaporative Emission System Vent Valve Control Circuit High

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