CHECK ENGINE LIGHT CAME UP DTC P0411 WHAT COULD BE THE PROBLEM

SOURCE: The check engine light has be checked several-P0411 error.

If were to venture a guess(and i am) it is either a valve or something that regulates either the rate of fresh air or the direction of it. Check the sec air valve or whatever VW calls it for blockage or sticking.

Harvey N Tawatao

• 3854 Answers
• Posted on Jan 28, 2010

SOURCE: engine light on . fault code p0411. air solenoid stuck shut. show

P0411 Secondary Air Injection System Incorrect Flow Detected
p0411 is a generic code, probably a vacume leak,vacume hose broken check this first, check the air pump turn on the car but it needs to be cold, you should hear a high pitched whine, this is the air pump running,there are 2 hoses one suction one blowing thishose should be going from the air pump to the air cleaner disconnect that and see what the volume is should be pretty strong.
But mostly you probably have a broken vacume line somewhere

SOURCE: check engine light on with DTC P0012

Check engine light on with

SOURCE: I have a 2007 saturn ion 2.2 with the check engine

Click this link. It will tell you all you need to know, and then some.

http://www.saturnfans.com/forums/showthread.php?p=1323640

SOURCE: my check engine light is on & the dtc is p0171 2005 chevy impala

I found this On-Line

Causes A code P0171 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor.

• In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
• Inspect all vacuum and PCV hoses, replace if necessary
• Check for a dirty fuel filter and proper fuel pressure