p0491
Moderate
Porsche · SUVs
Secondary Air Injection System Insufficient Flow (Bank 1)
Quick Answer
Error code P0491 on your Porsche SUVs means: Secondary Air Injection System Insufficient Flow (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
PO001PO003PO006PO002PO004PO005
Likely Causes
  1. Failed secondary air pump
  2. Blocked air injection hoses
  3. Air check valve failure
  4. Blown fuses or relay
How to Fix It
1
Check secondary air pump operation
2
Inspect air injection hoses for blockage
3
Test air check valve function
4
Verify pump relay and fuse status
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Secondary air pump
Air check valve
Injection hoses
Relay and fuse
Related Error Codes
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