p0491
Moderate
Dacia · SUVs & Cars
Secondary Air Injection System Malfunction (Bank 1)
Quick Answer
Error code P0491 on your Dacia SUVs & Cars means: Secondary Air Injection System Malfunction (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Test SAI pump relay operation
2
Inspect SAI pump for proper operation
3
Check SAI valve for blockage or malfunction
4
Verify SAI hoses for blockage or disconnection
5
Inspect exhaust manifold for leaks
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
SAI valve
SAI relay
SAI hoses
Exhaust manifold gasket
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