Engine check light still on After Diagnostic scan

First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM. Then the EPC (Electronic Pedal Control) yellow light will turn OFF.

The check engine light:


The check engine light & EPC light:

First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM. Then the EPC (Electronic Pedal Control) yellow light will turn OFF.

Have you checked for engine fault codes? Did you run out of gas? Did the fuel pump stop working? You did not provide much information. It could be any number of things. Is the engine turning over but not starting? Do you have fuel pressure and ignition spark? Check the basics first..and have a diagnostic scan run. Hope this helps.

Because the Computer has detected a a problem in your car and store the code, So you need to scan your car to get the Code. Good luck

Volkswagen vehicles built after 1996 are equippedwith a system of sensors known as On Board Diagnostics (OBD II). These sensorsmonitor many vital engine functions and help to lower harmful emissions. Whenone of these sensors fails it sends a signal to the engine computer to illuminate the "CheckEngine" light in the dash. To clear this light you will need a diagnosticcode scanner. Scanners range in price from $40 to $120 and are available atmost auto parts stores.

1. Connect the diagnostic code scanner to the vehicle's diagnostic port. Theport will be located in the dash below the heater controls.. 2. Turn the key to the"Run" position, but do not start the engine. 3. Press the button on thescanner that reads "Scan for trouble codes." 4. Wait for the scanner to finishscanning the engine's computer. 5. Press the button on thescanner labeled "Clear all trouble codes." 6. Disconnect the diagnostic codescanner from the vehicle. Read more: How to Reseta Volkswagen Check Engine Light ' eHow.com

P0411-Secondary Air Injection Incorrect Upstream Flow Detected. Could be the vacuum hose, combi-valve, and/or the pump http://www.passatworld.com/forums/showthread.php?t=170246. Read that thread and see if you think you or maybe somebody you know can tackle the problem.

If light is on at start up its usually a glow plug gone .Won't make any differance to driving. You should get a diagnostic scan done which will tell you which plug is at fault.

i had this problem on my 2002 passat. it was the ignition coils. first set were replaced in 2002 as a vw recall. second set (at 122K miles) were relatively inexpensive to fix. just one failed but it made the engine run really rough - my mechanic was able to move it from one cylinder to the next to get the problem to repeat.

I would trust them but make sure it is just not in need of some kind of cleaning.

The check engine light coming on indicates that a "trouble code" has been set by the onboard computer and is stored in it's memory. There is a wide range of possible causes, such as bad sensor(s), wiring faults, leaking or disconnected vacuum line(s), out of acceptible range engine environmental variables... Some manufacturers even program the light to come when the maintenance schedule calls for service! (a clever ploy!)
The good news is that most of the larger auto parts stores now offer free computer diagnostic scans, where they can read the trouble code and reset/clear the check engine light. Some causes are a LOT more serious than others, so act accordingly on the indicated problem... and some causes are merely "glitches" in the system when there really is nothing wrong!
Hope this is helpful, and good luck with the Passat... nice car!