p0491
Moderate
Maserati · Sedans & Sports Cars
Secondary Air Injection System Not Operating (Bank 1)
Quick Answer
Error code P0491 on your Maserati Sedans & Sports Cars means: Secondary Air Injection System Not Operating (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Test secondary air pump operation
2
Inspect air injection hoses for damage
3
Check check valve for proper function
4
Test pump motor wiring and connectors
5
Verify ECM signal to pump activation
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 injection pump
Air injection hoses
Check valve assembly
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