P0492 Code: Secondary Air Injection System Insufficient Flow (Bank 2)

Some cars use a secondary air injection system to reduce tailpipe emissions. Depending on the vehicle, the system may supply air to the exhaust manifolds, the catalytic converter, or both at different times. The additional air helps reduce harmful exhaust gases through oxidation. The catalytic converter also warms up more quickly when air is added to the exhaust manifolds.

If the secondary air injection system develops a fault on the bank 2 side of the engine, the PCM will log a P0492 code.

What Does the P0492 Code Mean?

The Diagnostic Trouble Code (DTC) P0492 indicates “Secondary Air Injection System Insufficient Flow Bank 2.”

Most secondary air injection systems consist of an air pump, air management solenoids, necessary plumbing, and one or more check valves. To manage the flow of air through its passageways, the system opens or closes the valves.

In engines with two cylinder banks, the secondary air injection system typically supplies additional air to both banks.

The PCM regularly checks how much air flows through the secondary air injection system. If the computer notices that the system isn’t sending enough air to bank 2, it will set the powertrain code P0492.

Read our advanced discussion about secondary air injection systems to better understand codes like P0492.

Note: The definition of code P0492 may differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0492 Code?

• Clogged or disconnected vacuum hose
• Faulty PCM
• Bad secondary air pump control valve

• Problems with the secondary air pump
• Issues with the electrical wiring
• Obstructed secondary air injection passages

What are the Common Symptoms of the P0492 Code?

• Check engine light illuminated
• Increased tailpipe emissions

How to Diagnose the P0492 Code

The P0492 is a generic powertrain code. It applies to OBD II-compliant vehicles.

If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a certified mechanic. Otherwise, you may go ahead and diagnose the issue yourself.

To help you get started, here is a video that may give you an idea of what the process might involve:

How to Fix the P0492 Code

Attempting to fix a P0492 code may become a frustrating task if you don’t have the right tools and know-how to test the secondary air injection system. In most cases, it’s best to leave the job to a professional.

For DIYers with advanced technical knowledge and hands-on experience, who prefer to test and repair their vehicle on their own, it will be helpful to rely on the appropriate repair manual or refer to an online repair database.

Order a Replacement Vacuum Hose in the Comfort of Your Home

If your vacuum hose causes the P0429 code to set, it’s a good idea to replace it immediately. Exhaust system issues can cost considerable sums to fix, and they can cause your vehicle to fail its next emissions test. CarParts.com makes finding a compatible replacement vacuum hose fast and effortless.

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