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p0492
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BMW · SUVs
Secondary Air Injection System Insufficient Flow Bank 2
Quick Answer
Error code P0492 on your BMW SUVs means: Secondary Air Injection System Insufficient Flow Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
X1 M35i 2024X1 xDrive28i 2024X3 M 2024X3 M40i 2024X3 xDrive30i 2024X5 M 2024X5 M60i 2024X5 xDrive40i 2024X5 xDrive50e 2024X6 M 2024X6 M60i 2024X6 xDrive40i 2024X7 M60i 2024X7 xDrive40i 2024iX M60 2024iX xDrive50 2024X1X3 MX3X5 MX5X6X7iX
Likely Causes
  1. Failed secondary air injection pump
  2. Clogged bank 2 check valve with carbon deposits
  3. Blocked air injection passages in bank 2 cylinder head
  4. Faulty relay, fuse, or wiring for the air pump circuit
  5. Leaking or disconnected air hoses on bank 2
How to Fix It
1
Test secondary air pump activation and airflow output using BMW diagnostics
2
Inspect bank 2 check valve for carbon clogging or failure to open
3
Check the air pump relay, fuse, and wiring harness
4
Clean or replace blocked air passages in the bank 2 cylinder head
5
Replace faulty components and verify repair with a scan tool
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Secondary air injection pump
Secondary air check valve
Secondary air hoses
Air pump relay
Related Error Codes
P0171P0174P0300P0301P0335
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