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The chattering sounds like some thing loose,like a mounting bracket. or the shafts end play is excessive,there can be bearing failure at high mileage in the supercharger, The bearings are lubed by the engine oil while running check for oil leaks in the line to the supercharger.
there so many problem of engine that will command CHECK ENGINE light indicator on, its better that you will bring your car in your nearest car diagnostic,, to avoid misstroubledhooting, send again the codes and we will ask you what to do
VW's somehow got around disclosing what the check engine lite codes mean to anyone except a VW Dealer. Therefore, to eliminate another service charge from a local repair shop I recommend you take the vehicle to VW and have them scan the vehicle's ECU for codes and do the repair accordingly.
In 2001 the "Check Engine" light might give information about what's going on with the transmission. You may want to have it checked by a shop before the transmission decides to die. It might be a simple fix.
go to autoparts store and use their scanner to scan the computer and get the code. you may have to wait until you can catch it back on again. You can try resetting the computer by disconnecting battery for 30 minutes and see if that works first
o2 sensors will put your check-engine-light on. it is attached to the exhaust (closest to the motor)and rusts-out sometimes. you could try to fix it by buying the o2 sensor and use a socket-set to see if it loosens. i 'm not a mechanic but have had the issue, in the past, with the jetta II's and a 1997.the guys at vw dealers are great with info, if your a hands-on kinda guy/girl. mike420
I had the same problem with my son's 2001 Jetta.
If you have an after maket stereo installed, remove it and run your scan again.
Problem is an interuption of the diagnostic bus that runs throughout the car.
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