SOURCE: My jetta won't recognize the key
I have had this same issue ever since I purchased the car new in 2000. It seems to be a very intermittent issue, but I found that when it occurred, it was typically damp and between 40 and 50F.
In any case, the dealer was not able to diagnose and fix the problem. I did get them to give me a 4 digit pass code for the immobilizer. This pass code is entered by using the clock adjust knob and the odometer reset button. Once the pass code is entered, the car will start. However, this is not a permanent fix as you may need to enter the pass code again should the immobilizer activate.
Sometimes the Jetta will start after 5-6 trys when the immobilizer is activated, but if I crank anything past 10, I usually resort to the pass code.
I am searching today for solutions since I have needed to use the pass code twice in the last 4 times that I have neede to start the car, and the weather is perfect.
SOURCE: my 2000 jetta dies intermittently after it turns over
try fuel pump relay. do you have a check engine light
SOURCE: '99 VW Beetle dies after running a short time, and won't start
I have this same problem! EXACTLY. Did you ever find the problem??? Mine is 2000 Beetle.
SOURCE: manual transmission car will not start,no sound
does the starter solenoid get power when the key is held to crank and the clutch pedal depressed?
SOURCE: Jetta VW - 1999 won't start. Push started. Battery good. What should we look at first?
Good chance you either need a new starter, or ignition switch. Also, check the battery terminals for any sulfur corrotion. If there is, clean off with water and baking soda mix to neutralize the acid. stiff wire brush the terminals if possible, but if you do not have a memory saver plugged into the aux voltage input(cigarette lighter), you will loose Radio, TCM, and ECM programming when batterey is disconnected.
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