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Easiest way to fix this is to have the error code/s read using an OBDII reader.. Dealers can do it, but charge a lot.. see if you can borrow one, or use a local garage to read them cheaply.. Or buy a code reader, they are not too expensive, and cheaper than having the dealer read the codes..
Once you know what the codes are, you will know what is wrong, and also an idea of cost to repair.
Many cars in the late 1980s and almost all cars since the mid 1990s have some kind of immobilizer system installed. If you provide us with the manufacturer, year, and model of your vehicle we can help you better.
The "immobilizer" isn't just one specific part. It's a combination of parts. ECU, Instrument Panel, Key and a Relay Box. Saying "the immobilizer might be bad" is a sign to me that they have no idea what they are talking about. You'd be much better off taking it to an independent shop that specializes in German cars.
That said, a battery going dead doesn't cause the immobilizer to lose the key programming. HOwever, when you program keys, they must all be done at the same time. You can't add one individually, they have to be done all at once. And yes, you need special equipment to program a key. There is an aftermarket diagnostic equipment called "VCDS" or "VAG COM" that can be used for the same purposes, most independent shops will have one of these. You can also buy one yourself:
Sorry to say, but your key has lost it's security code. If you have another key, try it, sometimes that is all it is. It may or may not work. If you continue to get the error code the immobilizer will need to be replaced or reprogramed. Good luck, i hope this helps.
The key has a micro chip in it that transmits a signal/code to the anti-theft module/immobilizer. There have been cases where the immobiler/module has forgotten wht code it should respond to or the chip in the key has gone bad. Either way the vehicle will have to go to the dealer for repair as they will have to reprogram the immobilizer for the new key and vice versa depending on which of the 2 items went bad. Hope this helps u
If there is a blinking car icon with an "X" over it. This icon means the Immobilizer has been activated and hence won't allow the car to start. It could be due to a bad SCU, Start Control Unit. The SCU is actually the ignition switch on these cars. Most of the time it's triggered by the anti-theft system..You can try this trick i learned that the dealers won't tell you...try locking and unlocking of the doors five times with the remote to reset the immobilizer and see if this helps. Good luck..i hope this helps...please take a minute to rate me a fixya.
An immobilizer bypass is an electrical circuit which allows current to flow to whatever component is starved of current to keep the engine from running (usually the coil). The immobilizer opens the circuit to the coil, the immobilizer bypass closes the circuit to the coil.
If you didn't install an immobilizer circuit, then you don't need the bypass. There are probably instructions you missed in the manual explaining the immobilizer circuit.
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