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p0492
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BMW · Sedans
Secondary Air Injection System Insufficient Flow Bank 2
Quick Answer
Error code P0492 on your BMW Sedans 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
330i530i540i740i760i330e 2024330i xDrive 2024530i 2024530i xDrive 2024540i xDrive 2024545e xDrive 2024740i 2024740i xDrive 2024760i xDrive 2024M3 CS 2024M3 Competition 2024M3 Competition xDrive 2024M340i xDrive 2024i4 M50 2024i4 eDrive35 2024i4 eDrive40 2024M3M340ii4i5
Likely Causes
  1. Failed secondary air injection pump
  2. Clogged check valve on bank 2
  3. Carbon deposits blocking air passages in cylinder head
  4. Faulty secondary air pump relay or wiring
  5. Leaking or disconnected secondary air hoses on bank 2
How to Fix It
1
Test secondary air pump operation using BMW diagnostic software
2
Inspect bank 2 check valve for carbon clogging or failure
3
Check secondary air pump relay, fuse, and wiring on bank 2 circuit
4
Remove and clean or replace blocked air passages in the cylinder head
5
Replace components as needed and verify airflow 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
Cylinder head gasket set
Related Error Codes
P0171P0174P0300P0335P0340
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