Volkswagen Jetta P0411: Secondary Air Injection System → Incorrect Flow Detected

P0411 It is an OBDII general trouble code that has the same meaning as the Volkswagen Jetta It would with any other truck or car.  This code signifies that an ECM detects incorrect air flow in secondary air injection systems. 

P0411: Secondary Air Injection System → Incorrect Flow Detected

To reduce exhaust emissions, the secondary air injection system injects oxygen into the exhaust.  P0411 usually means that the one-way valve or pump is failing. However, there are many other possible reasons why P0411 is thrown.

P0411 Symptoms:  Volkswagen Jetta

Some symptoms of P0411 may affect your Jetta's drivability.  These symptoms are most commonly seen:

• Backfiring-  If the AIR system is not running right, the extra fuel vapor in the exhaust can combust under hard acceleration.
• Rich condition

Jetta P0411 Diagnosis

Typically, the AIR system has three major components.  These are the pump and hoses.  It is possible to inspect the fuse for all of these electronic controls.

You can use a scan tool to turn the AIR pump ON.  If it doesn’t respond, you’ll know that it’s gone bad.

Here’s a great video on diagnosing this code from Flat Rate Mechanic:

One-way Check Valve

P0411 can be caused by a one-way check valve failure.  It allows water into the pump when it fails.  In winter, this moisture may freeze.

The fuse may be blown if frozen water freezes up on the pump.  The fuse is usually located under the vehicle's hood.  That’s a great place to start looking.   You can see in a matter of seconds if the fuse is blown.

Air Pump

This is most commonly caused by P0411.  These are It is very affordable.  If they refuse to accept instructions from the ECU then P0411 is thrown.

A Leakage in the Exhaust

ECMs may think there is an issue with the AIR system because the exhaust can leak.  You should inspect the exhaust system for any damage.  If there’s a leak, you should be able to hear it.  

Conclusion 

The P0411 code in Volkswagen Jetta will not cause it to stop working but could affect its drivability.  Any time the check engine light comes on, it’s a good idea to service it as soon possible though.

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