Automotive Column 32 Air Injection Code
Syndicated Newspaper Column
So many codes, so little time. Check engine lights. They can be a real pain for both the driver and the tech trying to fix it. Take our word for it folks; techs don't want the vehicle to have to come back if the light returns for the same cause as much as you don't want to have to go back to the shop.
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Dear Motor Medics,
I have a 2002 Volkswagen Beetle with the 4 cylinder 1.8L Turbo. The engine runs great but I have a check engine light on with a code P0411 stored in memory. This code is for the secondary air injection system. The air injection pump runs and the hoses look good. I have been told it might be the check valve but I can't seem to locate this. Have you heard of this problem on Beetles and can you help me locate the elusive "check valve" and am I going in the right direction? I listen via your web site; you guys do a great job.
Rodger in Florida
I am familiar with the problem you are having and it is common to many vehicles with a secondary air injection pump. Cars in the southern climates don’t seem to be bothered by it as much as cold weather states but none the less it happens. The vehicle could have a bad air diverter check valve but it could be as simple as condensation in the air hose between the pump and the valve. The air valve is located on the engine at the passenger side rear just under the top cover. Remove the hose and check it for water, then clean it out if it is present’ reinstall it, and see how it works. You will need to have the codes cleared before the system will operate and run a self-test.
Take care, the Motor Medics
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Advice given by the Motor Medics is for entertainment only. Each problem is different and requires different approaches and answers given here are opinions and just one possibility. Always follow all recommended safety procedures and consult with your own qualified technician before attempting repairs of any kind.