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Q: 2002 New Beetle engine light stay on on 2002 Volkswagen Beetle

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I have checked the codes and it only show one P0455 Evap emission leak. The dealer said this could be a loose fitting gas cap or vacuum leak. I had a mechanic replace the coolant temp sensor and the oil sending unit one week ago and now the car will not run. It will crank up and run for 1 sec and then shut off. I have checked for codes but only the P0455 showes up. Can someone tell me what my problem might be?
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The most common cause for intermittent problems the the new anti-theft systems is the module that "reads" the key - usually part of the ignition lock cylinder. I am not as familiar with the immobilizer system that VW uses so I cannot be sure the problem is with the ignition lock cylinder.
I Don't know the cause but I've had problems with it as well. I tried getting a key made at a dealer and they couldn't get the car to "synch" with it. I went to another dealer and they had no problem getting the key made. I've also had problems with the immoblizer not allowing the vehicle to start no matter which key I used. It happends intermittently and I found an internet fix that works so I haven't had it looked into any further. If it happens disconnect both battery cables and hold them together (away from the battery posts) have someone depress the brake pedal. This discharges stored energy in the capacitor and resets the computer default settings, the vehicle will start.
If sounds like you may have a theft system issue with your 2002 Beetle. You stalling problem is probably not related to the EVAP fault. Why were the coolant temp sensor and oil sending unit replaced?
You were correct about the theft system. What is still puzzeling is that the repair guy couldn't explain why the immoblized actived. He said it may happen again. I replaced the coolant temp sensor for two reasons. The first reason was that we had a code P1296 show up one day and know one including the dealership knew what it was. After a lot of research I final found the answer on (P1296 solver). The second reason was that the pipe (hose) where the coolant sensor is located was leaking so I just replaced both. The oil indicator light came on one day when my daughter was driving home from school. I checked the oil which was OK, so I had the repair guy check the oil pressure which was also OK. So we figured the sending unit was faulty.
Any idea as what might have caused the theft system to activate?
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