P0492 on 2011-2016 Audi Q7 — Secondary Air Injection System Insufficient Flow (Bank 2)
1 vehicles · 1 makes
Most Reported On
P0492 is an OBD-II diagnostic trouble code meaning “Secondary Air Injection System Insufficient Flow (Bank 2).” This code means the PCM determined that the secondary air injection system is delivering insufficient airflow into the exhaust on Bank 2. The system injects fresh air into the exhaust at cold start to speed catalytic converter warm-up and reduce emissions. Insufficient flow on Bank 2 indicates a blockage, leak, or weak pump affecting that bank. It generally triggers the check engine light and impacts cold-start emissions rather than normal driving. This code is most commonly reported on 2011-2016 Audi Q7.
Common Causes
Diagnostic Tools
To diagnose P0492, you'll need an OBD-II scanner. Here are our recommendations at every price point.
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FAQ
What does P0492 mean?
P0492 stands for "Secondary Air Injection System Insufficient Flow (Bank 2)." This code means the PCM determined that the secondary air injection system is delivering insufficient airflow into the exhaust on Bank 2. The system injects fresh air into the exhaust at cold start to speed catalytic converter warm-up and reduce emissions. Insufficient flow on Bank 2 indicates a blockage, leak, or weak pump affecting that bank. It generally triggers the check engine light and impacts cold-start emissions rather than normal driving.
What are the most common causes of P0492?
The most common causes of P0492 are: Clogged or restricted secondary air injection passages (Bank 2), Failing secondary air injection pump, Stuck or leaking air switching/check valve, Vacuum or hose leak in the air injection plumbing, Carbon buildup blocking air delivery ports, Electrical fault in the pump or valve circuit. The specific cause varies by vehicle.
How much does it cost to fix P0492?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0492?
Au7o has documented P0492 across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.