Question about Volkswagen Beetle
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:
They have a comprehensive manual explaining the process of programming keys.
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
SOURCE: Battery Charge
The best way is to get a voltmeter and check the voltage of the battery with the truck running and not running. When the truck is running, the voltage across the battery terminals should be aboput 14.9 volts (showing the alternator is charging the battery). With the truck off, the battery voltage should be about 12 volts (showing that the battery is holding the charge). From there, you should be able to tell which is bad.
Posted on Aug 14, 2008
It's not that unusual for a battery to fail that soon, and the "no lights, no nothing" says that it's the battery again. Your best bet at this point is to pull the battery and take it to the point of purchase for testing. They should either replace it under warranty or charge it for you. After you replace the battery you should have the charging/electrical system checked for possible shorts or power drains.
Posted on Feb 09, 2010
SOURCE: Renault Twingo with a key
yes i know what these cars are like ,a right pain in the you know where and the only solution is to calkl a truck and have it taken to the dealer ,its a europeon vehicle and uses encrypted software ,Now on earlier models you still get a spark and the immobilisor only shuts of the fuel pump so if you try running a hot wire direct to the fuel pump it should start anyway ,check for polarity on the sender unit where the fuel pump is ,access can be gained from under teh back seat on this vehicle ,if you do have to have it re-programmed then once its running with teh key cut the thrid wire on the immobilisor reader in the drivers side footwell with teh engine running and then it thinks it still has the key in the ignition .I HATE RENAULTS
Posted on Feb 15, 2011
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You have an electronic immobilizer key recognition problem. Your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel. Do you have this warning symbol lightning on the dashboard?
This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.
From year 1995 in Audi-VW (VAG) cars is used engine immobilizer. The VAG group immobilizer system consists of an immobilizer ECU which controls the recognition of keys and the Engine Management ECU system. Immobilizer is activated when the ignition key is removed and, together with the engine control unit, largely prevents unauthorized starting of the engine. The system uses a transmitter and receiver unit in the ignition key (transponder). Whenever an attempt is made to start the engine, it transmits a new code to the car's electronics. The immobilizing is only cancelled and car motor electronic receives permission to start engine if the key sends a right authorization code.
Use another ignition key that you have, and start the engine.
You will need to programm all ignition keys using suitable diagnostic equipment (VAS, VAG-Com) connected to the data link connector of the car.
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